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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /nsprpub/pr/src/pthreads/ptthread.c
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'nsprpub/pr/src/pthreads/ptthread.c')
-rw-r--r--nsprpub/pr/src/pthreads/ptthread.c1749
1 files changed, 1749 insertions, 0 deletions
diff --git a/nsprpub/pr/src/pthreads/ptthread.c b/nsprpub/pr/src/pthreads/ptthread.c
new file mode 100644
index 0000000000..92c9c7889e
--- /dev/null
+++ b/nsprpub/pr/src/pthreads/ptthread.c
@@ -0,0 +1,1749 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+** File: ptthread.c
+** Descritpion: Implemenation for threds using pthreds
+** Exports: ptthread.h
+*/
+
+#if defined(_PR_PTHREADS)
+
+#include "prlog.h"
+#include "primpl.h"
+#include "prpdce.h"
+
+#include <pthread.h>
+#include <unistd.h>
+#include <string.h>
+#include <signal.h>
+#include <dlfcn.h>
+
+#if defined(OPENBSD) || defined(FREEBSD) || defined(DRAGONFLY)
+#include <pthread_np.h>
+#endif
+
+#if defined(ANDROID)
+#include <sys/prctl.h>
+#endif
+
+#ifdef _PR_NICE_PRIORITY_SCHEDULING
+#undef _POSIX_THREAD_PRIORITY_SCHEDULING
+#include <sys/resource.h>
+#ifndef HAVE_GETTID
+#define gettid() (syscall(SYS_gettid))
+#endif
+#endif
+
+/*
+ * Record whether or not we have the privilege to set the scheduling
+ * policy and priority of threads. 0 means that privilege is available.
+ * EPERM means that privilege is not available.
+ */
+
+static PRIntn pt_schedpriv = 0;
+extern PRLock *_pr_sleeplock;
+
+static struct _PT_Bookeeping
+{
+ PRLock *ml; /* a lock to protect ourselves */
+ PRCondVar *cv; /* used to signal global things */
+ PRInt32 system, user; /* a count of the two different types */
+ PRUintn this_many; /* number of threads allowed for exit */
+ pthread_key_t key; /* thread private data key */
+ PRBool keyCreated; /* whether 'key' should be deleted */
+ PRThread *first, *last; /* list of threads we know about */
+#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+ PRInt32 minPrio, maxPrio; /* range of scheduling priorities */
+#endif
+} pt_book = {0};
+
+static void _pt_thread_death(void *arg);
+static void _pt_thread_death_internal(void *arg, PRBool callDestructors);
+static void init_pthread_gc_support(void);
+
+#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+static PRIntn pt_PriorityMap(PRThreadPriority pri)
+{
+#ifdef NTO
+ /* This priority algorithm causes lots of problems on Neutrino
+ * for now I have just hard coded everything to run at priority 10
+ * until I can come up with a new algorithm.
+ * Jerry.Kirk@Nexwarecorp.com
+ */
+ return 10;
+#else
+ return pt_book.minPrio +
+ pri * (pt_book.maxPrio - pt_book.minPrio) / PR_PRIORITY_LAST;
+#endif
+}
+#elif defined(_PR_NICE_PRIORITY_SCHEDULING)
+/*
+ * This functions maps higher priorities to lower nice values relative to the
+ * nice value specified in the |nice| parameter. The corresponding relative
+ * adjustments are:
+ *
+ * PR_PRIORITY_LOW +1
+ * PR_PRIORITY_NORMAL 0
+ * PR_PRIORITY_HIGH -1
+ * PR_PRIORITY_URGENT -2
+ */
+static int pt_RelativePriority(int nice, PRThreadPriority pri)
+{
+ return nice + (1 - pri);
+}
+#endif
+
+/*
+** Initialize a stack for a native pthread thread
+*/
+static void _PR_InitializeStack(PRThreadStack *ts)
+{
+ if( ts && (ts->stackTop == 0) ) {
+ ts->allocBase = (char *) &ts;
+ ts->allocSize = ts->stackSize;
+
+ /*
+ ** Setup stackTop and stackBottom values.
+ */
+#ifdef HAVE_STACK_GROWING_UP
+ ts->stackBottom = ts->allocBase + ts->stackSize;
+ ts->stackTop = ts->allocBase;
+#else
+ ts->stackTop = ts->allocBase;
+ ts->stackBottom = ts->allocBase - ts->stackSize;
+#endif
+ }
+}
+
+static void *_pt_root(void *arg)
+{
+ PRIntn rv;
+ PRThread *thred = (PRThread*)arg;
+ PRBool detached = (thred->state & PT_THREAD_DETACHED) ? PR_TRUE : PR_FALSE;
+ pthread_t id = pthread_self();
+#ifdef _PR_NICE_PRIORITY_SCHEDULING
+ pid_t tid;
+#endif
+
+#ifdef _PR_NICE_PRIORITY_SCHEDULING
+ /*
+ * We need to know the kernel thread ID of each thread in order to
+ * set its nice value hence we do it here instead of at creation time.
+ */
+ tid = gettid();
+ errno = 0;
+ rv = getpriority(PRIO_PROCESS, 0);
+
+ /* If we cannot read the main thread's nice value don't try to change the
+ * new thread's nice value. */
+ if (errno == 0) {
+ setpriority(PRIO_PROCESS, tid,
+ pt_RelativePriority(rv, thred->priority));
+ }
+#endif
+
+ /* Set up the thread stack information */
+ _PR_InitializeStack(thred->stack);
+
+ /*
+ * Set within the current thread the pointer to our object.
+ * This object will be deleted when the thread termintates,
+ * whether in a join or detached (see _PR_InitThreads()).
+ */
+ rv = pthread_setspecific(pt_book.key, thred);
+ PR_ASSERT(0 == rv);
+
+ /* make the thread visible to the rest of the runtime */
+ PR_Lock(pt_book.ml);
+ /*
+ * Both the parent thread and this new thread set thred->id.
+ * The new thread must ensure that thred->id is set before
+ * it executes its startFunc. The parent thread must ensure
+ * that thred->id is set before PR_CreateThread() returns.
+ * Both threads set thred->id while holding pt_book.ml and
+ * use thred->idSet to ensure thred->id is written only once.
+ */
+ if (!thred->idSet)
+ {
+ thred->id = id;
+ thred->idSet = PR_TRUE;
+ }
+ else
+ {
+ PR_ASSERT(pthread_equal(thred->id, id));
+ }
+
+#ifdef _PR_NICE_PRIORITY_SCHEDULING
+ thred->tid = tid;
+ PR_NotifyAllCondVar(pt_book.cv);
+#endif
+
+ /* If this is a GCABLE thread, set its state appropriately */
+ if (thred->suspend & PT_THREAD_SETGCABLE) {
+ thred->state |= PT_THREAD_GCABLE;
+ }
+ thred->suspend = 0;
+
+ thred->prev = pt_book.last;
+ if (pt_book.last) {
+ pt_book.last->next = thred;
+ }
+ else {
+ pt_book.first = thred;
+ }
+ thred->next = NULL;
+ pt_book.last = thred;
+ PR_Unlock(pt_book.ml);
+
+ thred->startFunc(thred->arg); /* make visible to the client */
+
+ /* unhook the thread from the runtime */
+ PR_Lock(pt_book.ml);
+ /*
+ * At this moment, PR_CreateThread() may not have set thred->id yet.
+ * It is safe for a detached thread to free thred only after
+ * PR_CreateThread() has accessed thred->id and thred->idSet.
+ */
+ if (detached)
+ {
+ while (!thred->okToDelete) {
+ PR_WaitCondVar(pt_book.cv, PR_INTERVAL_NO_TIMEOUT);
+ }
+ }
+
+ if (thred->state & PT_THREAD_SYSTEM) {
+ pt_book.system -= 1;
+ }
+ else if (--pt_book.user == pt_book.this_many) {
+ PR_NotifyAllCondVar(pt_book.cv);
+ }
+ if (NULL == thred->prev) {
+ pt_book.first = thred->next;
+ }
+ else {
+ thred->prev->next = thred->next;
+ }
+ if (NULL == thred->next) {
+ pt_book.last = thred->prev;
+ }
+ else {
+ thred->next->prev = thred->prev;
+ }
+ PR_Unlock(pt_book.ml);
+
+ /*
+ * Here we set the pthread's backpointer to the PRThread to NULL.
+ * Otherwise the destructor would get called eagerly as the thread
+ * returns to the pthread runtime. The joining thread would them be
+ * the proud possessor of a dangling reference. However, this is the
+ * last chance to delete the object if the thread is detached, so
+ * just let the destructor do the work.
+ */
+ if (PR_FALSE == detached)
+ {
+ /* Call TPD destructors on this thread. */
+ _PR_DestroyThreadPrivate(thred);
+ rv = pthread_setspecific(pt_book.key, NULL);
+ PR_ASSERT(0 == rv);
+ }
+
+ return NULL;
+} /* _pt_root */
+
+static PRThread* pt_AttachThread(void)
+{
+ PRThread *thred = NULL;
+
+ /*
+ * NSPR must have been initialized when PR_AttachThread is called.
+ * We cannot have PR_AttachThread call implicit initialization
+ * because if multiple threads call PR_AttachThread simultaneously,
+ * NSPR may be initialized more than once.
+ * We can't call any function that calls PR_GetCurrentThread()
+ * either (e.g., PR_SetError()) as that will result in infinite
+ * recursion.
+ */
+ if (!_pr_initialized) {
+ return NULL;
+ }
+
+ /* PR_NEWZAP must not call PR_GetCurrentThread() */
+ thred = PR_NEWZAP(PRThread);
+ if (NULL != thred)
+ {
+ int rv;
+
+ thred->priority = PR_PRIORITY_NORMAL;
+ thred->id = pthread_self();
+ thred->idSet = PR_TRUE;
+#ifdef _PR_NICE_PRIORITY_SCHEDULING
+ thred->tid = gettid();
+#endif
+ rv = pthread_setspecific(pt_book.key, thred);
+ PR_ASSERT(0 == rv);
+
+ thred->state = PT_THREAD_GLOBAL | PT_THREAD_FOREIGN;
+ PR_Lock(pt_book.ml);
+
+ /* then put it into the list */
+ thred->prev = pt_book.last;
+ if (pt_book.last) {
+ pt_book.last->next = thred;
+ }
+ else {
+ pt_book.first = thred;
+ }
+ thred->next = NULL;
+ pt_book.last = thred;
+ PR_Unlock(pt_book.ml);
+
+ }
+ return thred; /* may be NULL */
+} /* pt_AttachThread */
+
+static PRThread* _PR_CreateThread(
+ PRThreadType type, void (*start)(void *arg),
+ void *arg, PRThreadPriority priority, PRThreadScope scope,
+ PRThreadState state, PRUint32 stackSize, PRBool isGCAble)
+{
+ int rv;
+ PRThread *thred;
+ pthread_attr_t tattr;
+
+ if (!_pr_initialized) {
+ _PR_ImplicitInitialization();
+ }
+
+ if ((PRIntn)PR_PRIORITY_FIRST > (PRIntn)priority) {
+ priority = PR_PRIORITY_FIRST;
+ }
+ else if ((PRIntn)PR_PRIORITY_LAST < (PRIntn)priority) {
+ priority = PR_PRIORITY_LAST;
+ }
+
+ rv = _PT_PTHREAD_ATTR_INIT(&tattr);
+ PR_ASSERT(0 == rv);
+
+ if (EPERM != pt_schedpriv)
+ {
+#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+ struct sched_param schedule;
+#endif
+
+#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+ rv = pthread_attr_setinheritsched(&tattr, PTHREAD_EXPLICIT_SCHED);
+ PR_ASSERT(0 == rv);
+#endif
+
+ /* Use the default scheduling policy */
+
+#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+ rv = pthread_attr_getschedparam(&tattr, &schedule);
+ PR_ASSERT(0 == rv);
+ schedule.sched_priority = pt_PriorityMap(priority);
+ rv = pthread_attr_setschedparam(&tattr, &schedule);
+ PR_ASSERT(0 == rv);
+#ifdef NTO
+ rv = pthread_attr_setschedpolicy(&tattr, SCHED_RR); /* Round Robin */
+ PR_ASSERT(0 == rv);
+#endif
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING > 0 */
+ }
+
+ rv = pthread_attr_setdetachstate(&tattr,
+ ((PR_JOINABLE_THREAD == state) ?
+ PTHREAD_CREATE_JOINABLE : PTHREAD_CREATE_DETACHED));
+ PR_ASSERT(0 == rv);
+
+ /*
+ * If stackSize is 0, we use the default pthread stack size.
+ */
+ if (stackSize)
+ {
+#ifdef _MD_MINIMUM_STACK_SIZE
+ if (stackSize < _MD_MINIMUM_STACK_SIZE) {
+ stackSize = _MD_MINIMUM_STACK_SIZE;
+ }
+#endif
+ rv = pthread_attr_setstacksize(&tattr, stackSize);
+ PR_ASSERT(0 == rv);
+ }
+
+ thred = PR_NEWZAP(PRThread);
+ if (NULL == thred)
+ {
+ PR_SetError(PR_OUT_OF_MEMORY_ERROR, errno);
+ goto done;
+ }
+ else
+ {
+ pthread_t id;
+
+ thred->arg = arg;
+ thred->startFunc = start;
+ thred->priority = priority;
+ if (PR_UNJOINABLE_THREAD == state) {
+ thred->state |= PT_THREAD_DETACHED;
+ }
+
+ if (PR_LOCAL_THREAD == scope) {
+ scope = PR_GLOBAL_THREAD;
+ }
+
+ if (PR_GLOBAL_BOUND_THREAD == scope) {
+#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+ rv = pthread_attr_setscope(&tattr, PTHREAD_SCOPE_SYSTEM);
+ if (rv) {
+ /*
+ * system scope not supported
+ */
+ scope = PR_GLOBAL_THREAD;
+ /*
+ * reset scope
+ */
+ rv = pthread_attr_setscope(&tattr, PTHREAD_SCOPE_PROCESS);
+ PR_ASSERT(0 == rv);
+ }
+#endif
+ }
+ if (PR_GLOBAL_THREAD == scope) {
+ thred->state |= PT_THREAD_GLOBAL;
+ }
+ else if (PR_GLOBAL_BOUND_THREAD == scope) {
+ thred->state |= (PT_THREAD_GLOBAL | PT_THREAD_BOUND);
+ }
+ else { /* force it global */
+ thred->state |= PT_THREAD_GLOBAL;
+ }
+ if (PR_SYSTEM_THREAD == type) {
+ thred->state |= PT_THREAD_SYSTEM;
+ }
+
+ thred->suspend =(isGCAble) ? PT_THREAD_SETGCABLE : 0;
+
+ thred->stack = PR_NEWZAP(PRThreadStack);
+ if (thred->stack == NULL) {
+ PRIntn oserr = errno;
+ PR_Free(thred); /* all that work ... poof! */
+ PR_SetError(PR_OUT_OF_MEMORY_ERROR, oserr);
+ thred = NULL; /* and for what? */
+ goto done;
+ }
+ thred->stack->stackSize = stackSize;
+ thred->stack->thr = thred;
+
+#ifdef PT_NO_SIGTIMEDWAIT
+ pthread_mutex_init(&thred->suspendResumeMutex,NULL);
+ pthread_cond_init(&thred->suspendResumeCV,NULL);
+#endif
+
+ /* make the thread counted to the rest of the runtime */
+ PR_Lock(pt_book.ml);
+ if (PR_SYSTEM_THREAD == type) {
+ pt_book.system += 1;
+ }
+ else {
+ pt_book.user += 1;
+ }
+ PR_Unlock(pt_book.ml);
+
+ /*
+ * We pass a pointer to a local copy (instead of thred->id)
+ * to pthread_create() because who knows what wacky things
+ * pthread_create() may be doing to its argument.
+ */
+ rv = _PT_PTHREAD_CREATE(&id, tattr, _pt_root, thred);
+
+ if (EPERM == rv)
+ {
+ /* Remember that we don't have thread scheduling privilege. */
+ pt_schedpriv = EPERM;
+ PR_LOG(_pr_thread_lm, PR_LOG_MIN,
+ ("_PR_CreateThread: no thread scheduling privilege"));
+ /* Try creating the thread again without setting priority. */
+#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+ rv = pthread_attr_setinheritsched(&tattr, PTHREAD_INHERIT_SCHED);
+ PR_ASSERT(0 == rv);
+#endif
+ rv = _PT_PTHREAD_CREATE(&id, tattr, _pt_root, thred);
+ }
+
+ if (0 != rv)
+ {
+ PRIntn oserr = rv;
+ PR_Lock(pt_book.ml);
+ if (thred->state & PT_THREAD_SYSTEM) {
+ pt_book.system -= 1;
+ }
+ else if (--pt_book.user == pt_book.this_many) {
+ PR_NotifyAllCondVar(pt_book.cv);
+ }
+ PR_Unlock(pt_book.ml);
+
+ PR_Free(thred->stack);
+ PR_Free(thred); /* all that work ... poof! */
+ PR_SetError(PR_INSUFFICIENT_RESOURCES_ERROR, oserr);
+ thred = NULL; /* and for what? */
+ goto done;
+ }
+
+ PR_Lock(pt_book.ml);
+ /*
+ * Both the parent thread and this new thread set thred->id.
+ * The parent thread must ensure that thred->id is set before
+ * PR_CreateThread() returns. (See comments in _pt_root().)
+ */
+ if (!thred->idSet)
+ {
+ thred->id = id;
+ thred->idSet = PR_TRUE;
+ }
+ else
+ {
+ PR_ASSERT(pthread_equal(thred->id, id));
+ }
+
+ /*
+ * If the new thread is detached, tell it that PR_CreateThread() has
+ * accessed thred->id and thred->idSet so it's ok to delete thred.
+ */
+ if (PR_UNJOINABLE_THREAD == state)
+ {
+ thred->okToDelete = PR_TRUE;
+ PR_NotifyAllCondVar(pt_book.cv);
+ }
+ PR_Unlock(pt_book.ml);
+ }
+
+done:
+ rv = _PT_PTHREAD_ATTR_DESTROY(&tattr);
+ PR_ASSERT(0 == rv);
+
+ return thred;
+} /* _PR_CreateThread */
+
+PR_IMPLEMENT(PRThread*) PR_CreateThread(
+ PRThreadType type, void (*start)(void *arg), void *arg,
+ PRThreadPriority priority, PRThreadScope scope,
+ PRThreadState state, PRUint32 stackSize)
+{
+ return _PR_CreateThread(
+ type, start, arg, priority, scope, state, stackSize, PR_FALSE);
+} /* PR_CreateThread */
+
+PR_IMPLEMENT(PRThread*) PR_CreateThreadGCAble(
+ PRThreadType type, void (*start)(void *arg), void *arg,
+ PRThreadPriority priority, PRThreadScope scope,
+ PRThreadState state, PRUint32 stackSize)
+{
+ return _PR_CreateThread(
+ type, start, arg, priority, scope, state, stackSize, PR_TRUE);
+} /* PR_CreateThreadGCAble */
+
+PR_IMPLEMENT(void*) GetExecutionEnvironment(PRThread *thred)
+{
+ return thred->environment;
+} /* GetExecutionEnvironment */
+
+PR_IMPLEMENT(void) SetExecutionEnvironment(PRThread *thred, void *env)
+{
+ thred->environment = env;
+} /* SetExecutionEnvironment */
+
+PR_IMPLEMENT(PRThread*) PR_AttachThread(
+ PRThreadType type, PRThreadPriority priority, PRThreadStack *stack)
+{
+ return PR_GetCurrentThread();
+} /* PR_AttachThread */
+
+
+PR_IMPLEMENT(PRStatus) PR_JoinThread(PRThread *thred)
+{
+ int rv = -1;
+ void *result = NULL;
+ PR_ASSERT(thred != NULL);
+
+ if ((0xafafafaf == thred->state)
+ || (PT_THREAD_DETACHED == (PT_THREAD_DETACHED & thred->state))
+ || (PT_THREAD_FOREIGN == (PT_THREAD_FOREIGN & thred->state)))
+ {
+ /*
+ * This might be a bad address, but if it isn't, the state should
+ * either be an unjoinable thread or it's already had the object
+ * deleted. However, the client that called join on a detached
+ * thread deserves all the rath I can muster....
+ */
+ PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+ PR_LogPrint(
+ "PR_JoinThread: %p not joinable | already smashed\n", thred);
+ }
+ else
+ {
+ pthread_t id = thred->id;
+ rv = pthread_join(id, &result);
+ PR_ASSERT(rv == 0 && result == NULL);
+ if (0 == rv)
+ {
+ /*
+ * PR_FALSE, because the thread already called the TPD
+ * destructors before exiting _pt_root.
+ */
+ _pt_thread_death_internal(thred, PR_FALSE);
+ }
+ else
+ {
+ PRErrorCode prerror;
+ switch (rv)
+ {
+ case EINVAL: /* not a joinable thread */
+ case ESRCH: /* no thread with given ID */
+ prerror = PR_INVALID_ARGUMENT_ERROR;
+ break;
+ case EDEADLK: /* a thread joining with itself */
+ prerror = PR_DEADLOCK_ERROR;
+ break;
+ default:
+ prerror = PR_UNKNOWN_ERROR;
+ break;
+ }
+ PR_SetError(prerror, rv);
+ }
+ }
+ return (0 == rv) ? PR_SUCCESS : PR_FAILURE;
+} /* PR_JoinThread */
+
+PR_IMPLEMENT(void) PR_DetachThread(void)
+{
+ void *thred;
+ int rv;
+
+ _PT_PTHREAD_GETSPECIFIC(pt_book.key, thred);
+ if (NULL == thred) {
+ return;
+ }
+ _pt_thread_death(thred);
+ rv = pthread_setspecific(pt_book.key, NULL);
+ PR_ASSERT(0 == rv);
+} /* PR_DetachThread */
+
+PR_IMPLEMENT(PRThread*) PR_GetCurrentThread(void)
+{
+ void *thred;
+
+ if (!_pr_initialized) {
+ _PR_ImplicitInitialization();
+ }
+
+ _PT_PTHREAD_GETSPECIFIC(pt_book.key, thred);
+ if (NULL == thred) {
+ thred = pt_AttachThread();
+ }
+ PR_ASSERT(NULL != thred);
+ return (PRThread*)thred;
+} /* PR_GetCurrentThread */
+
+PR_IMPLEMENT(PRThreadScope) PR_GetThreadScope(const PRThread *thred)
+{
+ return (thred->state & PT_THREAD_BOUND) ?
+ PR_GLOBAL_BOUND_THREAD : PR_GLOBAL_THREAD;
+} /* PR_GetThreadScope() */
+
+PR_IMPLEMENT(PRThreadType) PR_GetThreadType(const PRThread *thred)
+{
+ return (thred->state & PT_THREAD_SYSTEM) ?
+ PR_SYSTEM_THREAD : PR_USER_THREAD;
+}
+
+PR_IMPLEMENT(PRThreadState) PR_GetThreadState(const PRThread *thred)
+{
+ return (thred->state & PT_THREAD_DETACHED) ?
+ PR_UNJOINABLE_THREAD : PR_JOINABLE_THREAD;
+} /* PR_GetThreadState */
+
+PR_IMPLEMENT(PRThreadPriority) PR_GetThreadPriority(const PRThread *thred)
+{
+ PR_ASSERT(thred != NULL);
+ return thred->priority;
+} /* PR_GetThreadPriority */
+
+PR_IMPLEMENT(void) PR_SetThreadPriority(PRThread *thred, PRThreadPriority newPri)
+{
+ PRIntn rv;
+
+ PR_ASSERT(NULL != thred);
+
+ if ((PRIntn)PR_PRIORITY_FIRST > (PRIntn)newPri) {
+ newPri = PR_PRIORITY_FIRST;
+ }
+ else if ((PRIntn)PR_PRIORITY_LAST < (PRIntn)newPri) {
+ newPri = PR_PRIORITY_LAST;
+ }
+
+#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+ if (EPERM != pt_schedpriv)
+ {
+ int policy;
+ struct sched_param schedule;
+
+ rv = pthread_getschedparam(thred->id, &policy, &schedule);
+ if(0 == rv) {
+ schedule.sched_priority = pt_PriorityMap(newPri);
+ rv = pthread_setschedparam(thred->id, policy, &schedule);
+ if (EPERM == rv)
+ {
+ pt_schedpriv = EPERM;
+ PR_LOG(_pr_thread_lm, PR_LOG_MIN,
+ ("PR_SetThreadPriority: no thread scheduling privilege"));
+ }
+ }
+ if (rv != 0) {
+ rv = -1;
+ }
+ }
+#elif defined(_PR_NICE_PRIORITY_SCHEDULING)
+ PR_Lock(pt_book.ml);
+ while (thred->tid == 0) {
+ PR_WaitCondVar(pt_book.cv, PR_INTERVAL_NO_TIMEOUT);
+ }
+ PR_Unlock(pt_book.ml);
+
+ errno = 0;
+ rv = getpriority(PRIO_PROCESS, 0);
+
+ /* Do not proceed unless we know the main thread's nice value. */
+ if (errno == 0) {
+ rv = setpriority(PRIO_PROCESS, thred->tid,
+ pt_RelativePriority(rv, newPri));
+
+ if (rv == -1)
+ {
+ /* We don't set pt_schedpriv to EPERM in case errno == EPERM
+ * because adjusting the nice value might be permitted for certain
+ * ranges but not for others. */
+ PR_LOG(_pr_thread_lm, PR_LOG_MIN,
+ ("PR_SetThreadPriority: setpriority failed with error %d",
+ errno));
+ }
+ }
+#else
+ (void)rv; /* rv is unused */
+#endif
+
+ thred->priority = newPri;
+} /* PR_SetThreadPriority */
+
+PR_IMPLEMENT(PRStatus) PR_Interrupt(PRThread *thred)
+{
+ /*
+ ** If the target thread indicates that it's waiting,
+ ** find the condition and broadcast to it. Broadcast
+ ** since we don't know which thread (if there are more
+ ** than one). This sounds risky, but clients must
+ ** test their invariants when resumed from a wait and
+ ** I don't expect very many threads to be waiting on
+ ** a single condition and I don't expect interrupt to
+ ** be used very often.
+ **
+ ** I don't know why I thought this would work. Must have
+ ** been one of those weaker momements after I'd been
+ ** smelling the vapors.
+ **
+ ** Even with the followng changes it is possible that
+ ** the pointer to the condition variable is pointing
+ ** at a bogus value. Will the unerlying code detect
+ ** that?
+ */
+ PRCondVar *cv;
+ PR_ASSERT(NULL != thred);
+ if (NULL == thred) {
+ return PR_FAILURE;
+ }
+
+ thred->state |= PT_THREAD_ABORTED;
+
+ cv = thred->waiting;
+ if ((NULL != cv) && !thred->interrupt_blocked)
+ {
+ PRIntn rv;
+ (void)PR_ATOMIC_INCREMENT(&cv->notify_pending);
+ rv = pthread_cond_broadcast(&cv->cv);
+ PR_ASSERT(0 == rv);
+ if (0 > PR_ATOMIC_DECREMENT(&cv->notify_pending)) {
+ PR_DestroyCondVar(cv);
+ }
+ }
+ return PR_SUCCESS;
+} /* PR_Interrupt */
+
+PR_IMPLEMENT(void) PR_ClearInterrupt(void)
+{
+ PRThread *me = PR_GetCurrentThread();
+ me->state &= ~PT_THREAD_ABORTED;
+} /* PR_ClearInterrupt */
+
+PR_IMPLEMENT(void) PR_BlockInterrupt(void)
+{
+ PRThread *me = PR_GetCurrentThread();
+ _PT_THREAD_BLOCK_INTERRUPT(me);
+} /* PR_BlockInterrupt */
+
+PR_IMPLEMENT(void) PR_UnblockInterrupt(void)
+{
+ PRThread *me = PR_GetCurrentThread();
+ _PT_THREAD_UNBLOCK_INTERRUPT(me);
+} /* PR_UnblockInterrupt */
+
+PR_IMPLEMENT(PRStatus) PR_Yield(void)
+{
+ static PRBool warning = PR_TRUE;
+ if (warning) warning = _PR_Obsolete(
+ "PR_Yield()", "PR_Sleep(PR_INTERVAL_NO_WAIT)");
+ return PR_Sleep(PR_INTERVAL_NO_WAIT);
+}
+
+PR_IMPLEMENT(PRStatus) PR_Sleep(PRIntervalTime ticks)
+{
+ PRStatus rv = PR_SUCCESS;
+
+ if (!_pr_initialized) {
+ _PR_ImplicitInitialization();
+ }
+
+ if (PR_INTERVAL_NO_WAIT == ticks)
+ {
+ _PT_PTHREAD_YIELD();
+ }
+ else
+ {
+ PRCondVar *cv;
+ PRIntervalTime timein;
+
+ timein = PR_IntervalNow();
+ cv = PR_NewCondVar(_pr_sleeplock);
+ PR_ASSERT(cv != NULL);
+ PR_Lock(_pr_sleeplock);
+ do
+ {
+ PRIntervalTime now = PR_IntervalNow();
+ PRIntervalTime delta = now - timein;
+ if (delta > ticks) {
+ break;
+ }
+ rv = PR_WaitCondVar(cv, ticks - delta);
+ } while (PR_SUCCESS == rv);
+ PR_Unlock(_pr_sleeplock);
+ PR_DestroyCondVar(cv);
+ }
+ return rv;
+} /* PR_Sleep */
+
+static void _pt_thread_death(void *arg)
+{
+ void *thred;
+ int rv;
+
+ _PT_PTHREAD_GETSPECIFIC(pt_book.key, thred);
+ if (NULL == thred)
+ {
+ /*
+ * Have PR_GetCurrentThread return the expected value to the
+ * destructors.
+ */
+ rv = pthread_setspecific(pt_book.key, arg);
+ PR_ASSERT(0 == rv);
+ }
+
+ /* PR_TRUE for: call destructors */
+ _pt_thread_death_internal(arg, PR_TRUE);
+
+ if (NULL == thred)
+ {
+ rv = pthread_setspecific(pt_book.key, NULL);
+ PR_ASSERT(0 == rv);
+ }
+}
+
+static void _pt_thread_death_internal(void *arg, PRBool callDestructors)
+{
+ PRThread *thred = (PRThread*)arg;
+
+ if (thred->state & (PT_THREAD_FOREIGN|PT_THREAD_PRIMORD))
+ {
+ PR_Lock(pt_book.ml);
+ if (NULL == thred->prev) {
+ pt_book.first = thred->next;
+ }
+ else {
+ thred->prev->next = thred->next;
+ }
+ if (NULL == thred->next) {
+ pt_book.last = thred->prev;
+ }
+ else {
+ thred->next->prev = thred->prev;
+ }
+ PR_Unlock(pt_book.ml);
+ }
+ if (callDestructors) {
+ _PR_DestroyThreadPrivate(thred);
+ }
+ PR_Free(thred->privateData);
+ if (NULL != thred->errorString) {
+ PR_Free(thred->errorString);
+ }
+ if (NULL != thred->name) {
+ PR_Free(thred->name);
+ }
+ PR_Free(thred->stack);
+ if (NULL != thred->syspoll_list) {
+ PR_Free(thred->syspoll_list);
+ }
+#if defined(_PR_POLL_WITH_SELECT)
+ if (NULL != thred->selectfd_list) {
+ PR_Free(thred->selectfd_list);
+ }
+#endif
+#if defined(DEBUG)
+ memset(thred, 0xaf, sizeof(PRThread));
+#endif /* defined(DEBUG) */
+ PR_Free(thred);
+} /* _pt_thread_death */
+
+void _PR_InitThreads(
+ PRThreadType type, PRThreadPriority priority, PRUintn maxPTDs)
+{
+ int rv;
+ PRThread *thred;
+
+ PR_ASSERT(priority == PR_PRIORITY_NORMAL);
+
+#ifdef _PR_NEED_PTHREAD_INIT
+ /*
+ * On BSD/OS (3.1 and 4.0), the pthread subsystem is lazily
+ * initialized, but pthread_self() fails to initialize
+ * pthreads and hence returns a null thread ID if invoked
+ * by the primordial thread before any other pthread call.
+ * So we explicitly initialize pthreads here.
+ */
+ pthread_init();
+#endif
+
+#if _POSIX_THREAD_PRIORITY_SCHEDULING > 0
+#if defined(FREEBSD)
+ {
+ pthread_attr_t attr;
+ int policy;
+ /* get the min and max priorities of the default policy */
+ pthread_attr_init(&attr);
+ pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED);
+ pthread_attr_getschedpolicy(&attr, &policy);
+ pt_book.minPrio = sched_get_priority_min(policy);
+ PR_ASSERT(-1 != pt_book.minPrio);
+ pt_book.maxPrio = sched_get_priority_max(policy);
+ PR_ASSERT(-1 != pt_book.maxPrio);
+ pthread_attr_destroy(&attr);
+ }
+#else
+ /*
+ ** These might be function evaluations
+ */
+ pt_book.minPrio = PT_PRIO_MIN;
+ pt_book.maxPrio = PT_PRIO_MAX;
+#endif
+#endif
+
+ PR_ASSERT(NULL == pt_book.ml);
+ pt_book.ml = PR_NewLock();
+ PR_ASSERT(NULL != pt_book.ml);
+ pt_book.cv = PR_NewCondVar(pt_book.ml);
+ PR_ASSERT(NULL != pt_book.cv);
+ thred = PR_NEWZAP(PRThread);
+ PR_ASSERT(NULL != thred);
+ thred->arg = NULL;
+ thred->startFunc = NULL;
+ thred->priority = priority;
+ thred->id = pthread_self();
+ thred->idSet = PR_TRUE;
+#ifdef _PR_NICE_PRIORITY_SCHEDULING
+ thred->tid = gettid();
+#endif
+
+ thred->state = (PT_THREAD_DETACHED | PT_THREAD_PRIMORD);
+ if (PR_SYSTEM_THREAD == type)
+ {
+ thred->state |= PT_THREAD_SYSTEM;
+ pt_book.system += 1;
+ pt_book.this_many = 0;
+ }
+ else
+ {
+ pt_book.user += 1;
+ pt_book.this_many = 1;
+ }
+ thred->next = thred->prev = NULL;
+ pt_book.first = pt_book.last = thred;
+
+ thred->stack = PR_NEWZAP(PRThreadStack);
+ PR_ASSERT(thred->stack != NULL);
+ thred->stack->stackSize = 0;
+ thred->stack->thr = thred;
+ _PR_InitializeStack(thred->stack);
+
+ /*
+ * Create a key for our use to store a backpointer in the pthread
+ * to our PRThread object. This object gets deleted when the thread
+ * returns from its root in the case of a detached thread. Other
+ * threads delete the objects in Join.
+ *
+ * NB: The destructor logic seems to have a bug so it isn't used.
+ * NBB: Oh really? I'm going to give it a spin - AOF 19 June 1998.
+ * More info - the problem is that pthreads calls the destructor
+ * eagerly as the thread returns from its root, rather than lazily
+ * after the thread is joined. Therefore, threads that are joining
+ * and holding PRThread references are actually holding pointers to
+ * nothing.
+ */
+ rv = _PT_PTHREAD_KEY_CREATE(&pt_book.key, _pt_thread_death);
+ if (0 != rv) {
+ PR_Assert("0 == rv", __FILE__, __LINE__);
+ }
+ pt_book.keyCreated = PR_TRUE;
+ rv = pthread_setspecific(pt_book.key, thred);
+ PR_ASSERT(0 == rv);
+} /* _PR_InitThreads */
+
+#ifdef __GNUC__
+/*
+ * GCC supports the constructor and destructor attributes as of
+ * version 2.5.
+ */
+#if defined(DARWIN)
+/*
+ * The dynamic linker on OSX doesn't execute __attribute__((destructor))
+ * destructors in the right order wrt non-__attribute((destructor)) destructors
+ * in other libraries. So use atexit() instead, which does.
+ * See https://bugzilla.mozilla.org/show_bug.cgi?id=1399746#c99
+ */
+static void _PR_Fini(void);
+
+__attribute__ ((constructor))
+static void _register_PR_Fini() {
+ atexit(_PR_Fini);
+}
+#else
+static void _PR_Fini(void) __attribute__ ((destructor));
+#endif
+
+#elif defined(__SUNPRO_C)
+/*
+ * Sun Studio compiler
+ */
+#pragma fini(_PR_Fini)
+static void _PR_Fini(void);
+#elif defined(HPUX)
+/*
+ * Current versions of HP C compiler define __HP_cc.
+ * HP C compiler A.11.01.20 doesn't define __HP_cc.
+ */
+#if defined(__ia64) || defined(_LP64)
+#pragma FINI "_PR_Fini"
+static void _PR_Fini(void);
+#else
+/*
+ * Only HP-UX 10.x style initializers are supported in 32-bit links.
+ * Need to use the +I PR_HPUX10xInit linker option.
+ */
+#include <dl.h>
+
+static void _PR_Fini(void);
+
+void PR_HPUX10xInit(shl_t handle, int loading)
+{
+ /*
+ * This function is called when a shared library is loaded as well
+ * as when the shared library is unloaded. Note that it may not
+ * be called when the user's program terminates.
+ *
+ * handle is the shl_load API handle for the shared library being
+ * initialized.
+ *
+ * loading is non-zero at startup and zero at termination.
+ */
+ if (loading) {
+ /* ... do some initializations ... */
+ } else {
+ _PR_Fini();
+ }
+}
+#endif
+#elif defined(AIX)
+/* Need to use the -binitfini::_PR_Fini linker option. */
+#endif
+
+void _PR_Fini(void)
+{
+ void *thred;
+ int rv;
+
+ if (!_pr_initialized) {
+ /* Either NSPR was never successfully initialized or
+ * PR_Cleanup has been called already. */
+ if (pt_book.keyCreated)
+ {
+ rv = pthread_key_delete(pt_book.key);
+ PR_ASSERT(0 == rv);
+ pt_book.keyCreated = PR_FALSE;
+ }
+ return;
+ }
+
+ _PT_PTHREAD_GETSPECIFIC(pt_book.key, thred);
+ if (NULL != thred)
+ {
+ /*
+ * PR_FALSE, because it is unsafe to call back to the
+ * thread private data destructors at final cleanup.
+ */
+ _pt_thread_death_internal(thred, PR_FALSE);
+ rv = pthread_setspecific(pt_book.key, NULL);
+ PR_ASSERT(0 == rv);
+ }
+ rv = pthread_key_delete(pt_book.key);
+ PR_ASSERT(0 == rv);
+ pt_book.keyCreated = PR_FALSE;
+ /* TODO: free other resources used by NSPR */
+ /* _pr_initialized = PR_FALSE; */
+} /* _PR_Fini */
+
+PR_IMPLEMENT(PRStatus) PR_Cleanup(void)
+{
+ PRThread *me = PR_GetCurrentThread();
+ int rv;
+ PR_LOG(_pr_thread_lm, PR_LOG_MIN, ("PR_Cleanup: shutting down NSPR"));
+ PR_ASSERT(me->state & PT_THREAD_PRIMORD);
+ if (me->state & PT_THREAD_PRIMORD)
+ {
+ PR_Lock(pt_book.ml);
+ while (pt_book.user > pt_book.this_many) {
+ PR_WaitCondVar(pt_book.cv, PR_INTERVAL_NO_TIMEOUT);
+ }
+ if (me->state & PT_THREAD_SYSTEM) {
+ pt_book.system -= 1;
+ }
+ else {
+ pt_book.user -= 1;
+ }
+ PR_Unlock(pt_book.ml);
+
+ _PR_MD_EARLY_CLEANUP();
+
+ _PR_CleanupMW();
+ _PR_CleanupTime();
+ _PR_CleanupDtoa();
+ _PR_CleanupCallOnce();
+ _PR_ShutdownLinker();
+ _PR_LogCleanup();
+ _PR_CleanupNet();
+ /* Close all the fd's before calling _PR_CleanupIO */
+ _PR_CleanupIO();
+ _PR_CleanupCMon();
+
+ _pt_thread_death(me);
+ rv = pthread_setspecific(pt_book.key, NULL);
+ PR_ASSERT(0 == rv);
+ /*
+ * I am not sure if it's safe to delete the cv and lock here,
+ * since there may still be "system" threads around. If this
+ * call isn't immediately prior to exiting, then there's a
+ * problem.
+ */
+ if (0 == pt_book.system)
+ {
+ PR_DestroyCondVar(pt_book.cv); pt_book.cv = NULL;
+ PR_DestroyLock(pt_book.ml); pt_book.ml = NULL;
+ }
+ PR_DestroyLock(_pr_sleeplock);
+ _pr_sleeplock = NULL;
+ _PR_CleanupLayerCache();
+ _PR_CleanupEnv();
+#ifdef _PR_ZONE_ALLOCATOR
+ _PR_DestroyZones();
+#endif
+ _pr_initialized = PR_FALSE;
+ return PR_SUCCESS;
+ }
+ return PR_FAILURE;
+} /* PR_Cleanup */
+
+PR_IMPLEMENT(void) PR_ProcessExit(PRIntn status)
+{
+ _exit(status);
+}
+
+PR_IMPLEMENT(PRUint32) PR_GetThreadID(PRThread *thred)
+{
+ return (PRUint32)thred->id; /* and I don't know what they will do with it */
+}
+
+/*
+ * $$$
+ * The following two thread-to-processor affinity functions are not
+ * yet implemented for pthreads. By the way, these functions should return
+ * PRStatus rather than PRInt32 to indicate the success/failure status.
+ * $$$
+ */
+
+PR_IMPLEMENT(PRInt32) PR_GetThreadAffinityMask(PRThread *thread, PRUint32 *mask)
+{
+ return 0; /* not implemented */
+}
+
+PR_IMPLEMENT(PRInt32) PR_SetThreadAffinityMask(PRThread *thread, PRUint32 mask )
+{
+ return 0; /* not implemented */
+}
+
+PR_IMPLEMENT(void)
+PR_SetThreadDumpProc(PRThread* thread, PRThreadDumpProc dump, void *arg)
+{
+ thread->dump = dump;
+ thread->dumpArg = arg;
+}
+
+/*
+ * Garbage collection support follows.
+ */
+
+/* a bogus signal mask for forcing a timed wait */
+/* Not so bogus in AIX as we really do a sigwait */
+static sigset_t sigwait_set;
+
+static struct timespec onemillisec = {0, 1000000L};
+#ifndef PT_NO_SIGTIMEDWAIT
+static struct timespec hundredmillisec = {0, 100000000L};
+#endif
+
+static void suspend_signal_handler(PRIntn sig);
+
+#ifdef PT_NO_SIGTIMEDWAIT
+static void null_signal_handler(PRIntn sig);
+#endif
+
+/*
+ * Linux pthreads use SIGUSR1 and SIGUSR2 internally, which
+ * conflict with the use of these two signals in our GC support.
+ * So we don't know how to support GC on Linux pthreads.
+ */
+static void init_pthread_gc_support(void)
+{
+ PRIntn rv;
+
+ {
+ struct sigaction sigact_usr2;
+
+ sigact_usr2.sa_handler = suspend_signal_handler;
+ sigact_usr2.sa_flags = SA_RESTART;
+ sigemptyset (&sigact_usr2.sa_mask);
+
+ rv = sigaction (SIGUSR2, &sigact_usr2, NULL);
+ PR_ASSERT(0 == rv);
+
+ sigemptyset (&sigwait_set);
+#if defined(PT_NO_SIGTIMEDWAIT)
+ sigaddset (&sigwait_set, SIGUSR1);
+#else
+ sigaddset (&sigwait_set, SIGUSR2);
+#endif /* defined(PT_NO_SIGTIMEDWAIT) */
+ }
+#if defined(PT_NO_SIGTIMEDWAIT)
+ {
+ struct sigaction sigact_null;
+ sigact_null.sa_handler = null_signal_handler;
+ sigact_null.sa_flags = SA_RESTART;
+ sigemptyset (&sigact_null.sa_mask);
+ rv = sigaction (SIGUSR1, &sigact_null, NULL);
+ PR_ASSERT(0 ==rv);
+ }
+#endif /* defined(PT_NO_SIGTIMEDWAIT) */
+}
+
+PR_IMPLEMENT(void) PR_SetThreadGCAble(void)
+{
+ PR_Lock(pt_book.ml);
+ PR_GetCurrentThread()->state |= PT_THREAD_GCABLE;
+ PR_Unlock(pt_book.ml);
+}
+
+PR_IMPLEMENT(void) PR_ClearThreadGCAble(void)
+{
+ PR_Lock(pt_book.ml);
+ PR_GetCurrentThread()->state &= (~PT_THREAD_GCABLE);
+ PR_Unlock(pt_book.ml);
+}
+
+#if defined(DEBUG)
+static PRBool suspendAllOn = PR_FALSE;
+#endif
+
+static PRBool suspendAllSuspended = PR_FALSE;
+
+PR_IMPLEMENT(PRStatus) PR_EnumerateThreads(PREnumerator func, void *arg)
+{
+ PRIntn count = 0;
+ PRStatus rv = PR_SUCCESS;
+ PRThread* thred = pt_book.first;
+
+#if defined(DEBUG) || defined(FORCE_PR_ASSERT)
+ PRThread *me = PR_GetCurrentThread();
+#endif
+
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_EnumerateThreads\n"));
+ /*
+ * $$$
+ * Need to suspend all threads other than me before doing this.
+ * This is really a gross and disgusting thing to do. The only
+ * good thing is that since all other threads are suspended, holding
+ * the lock during a callback seems like child's play.
+ * $$$
+ */
+ PR_ASSERT(suspendAllOn);
+
+ while (thred != NULL)
+ {
+ /* Steve Morse, 4-23-97: Note that we can't walk a queue by taking
+ * qp->next after applying the function "func". In particular, "func"
+ * might remove the thread from the queue and put it into another one in
+ * which case qp->next no longer points to the next entry in the original
+ * queue.
+ *
+ * To get around this problem, we save qp->next in qp_next before applying
+ * "func" and use that saved value as the next value after applying "func".
+ */
+ PRThread* next = thred->next;
+
+ if (_PT_IS_GCABLE_THREAD(thred))
+ {
+ PR_ASSERT((thred == me) || (thred->suspend & PT_THREAD_SUSPENDED));
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("In PR_EnumerateThreads callback thread %p thid = %X\n",
+ thred, thred->id));
+
+ rv = func(thred, count++, arg);
+ if (rv != PR_SUCCESS) {
+ return rv;
+ }
+ }
+ thred = next;
+ }
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("End PR_EnumerateThreads count = %d \n", count));
+ return rv;
+} /* PR_EnumerateThreads */
+
+/*
+ * PR_SuspendAll and PR_ResumeAll are called during garbage collection. The strategy
+ * we use is to send a SIGUSR2 signal to every gc able thread that we intend to suspend.
+ * The signal handler will record the stack pointer and will block until resumed by
+ * the resume call. Since the signal handler is the last routine called for the
+ * suspended thread, the stack pointer will also serve as a place where all the
+ * registers have been saved on the stack for the previously executing routines.
+ *
+ * Through global variables, we also make sure that PR_Suspend and PR_Resume does not
+ * proceed until the thread is suspended or resumed.
+ */
+
+/*
+ * In the signal handler, we can not use condition variable notify or wait.
+ * This does not work consistently across all pthread platforms. We also can not
+ * use locking since that does not seem to work reliably across platforms.
+ * Only thing we can do is yielding while testing for a global condition
+ * to change. This does work on pthread supported platforms. We may have
+ * to play with priortities if there are any problems detected.
+ */
+
+/*
+ * In AIX, you cannot use ANY pthread calls in the signal handler except perhaps
+ * pthread_yield. But that is horribly inefficient. Hence we use only sigwait, no
+ * sigtimedwait is available. We need to use another user signal, SIGUSR1. Actually
+ * SIGUSR1 is also used by exec in Java. So our usage here breaks the exec in Java,
+ * for AIX. You cannot use pthread_cond_wait or pthread_delay_np in the signal
+ * handler as all synchronization mechanisms just break down.
+ */
+
+#if defined(PT_NO_SIGTIMEDWAIT)
+static void null_signal_handler(PRIntn sig)
+{
+ return;
+}
+#endif
+
+static void suspend_signal_handler(PRIntn sig)
+{
+ PRThread *me = PR_GetCurrentThread();
+
+ PR_ASSERT(me != NULL);
+ PR_ASSERT(_PT_IS_GCABLE_THREAD(me));
+ PR_ASSERT((me->suspend & PT_THREAD_SUSPENDED) == 0);
+
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("Begin suspend_signal_handler thred %p thread id = %X\n",
+ me, me->id));
+
+ /*
+ * save stack pointer
+ */
+ me->sp = &me;
+
+ /*
+ At this point, the thread's stack pointer has been saved,
+ And it is going to enter a wait loop until it is resumed.
+ So it is _really_ suspended
+ */
+
+ me->suspend |= PT_THREAD_SUSPENDED;
+
+ /*
+ * now, block current thread
+ */
+#if defined(PT_NO_SIGTIMEDWAIT)
+ pthread_cond_signal(&me->suspendResumeCV);
+ while (me->suspend & PT_THREAD_SUSPENDED)
+ {
+#if !defined(FREEBSD) && !defined(NETBSD) && !defined(OPENBSD) \
+ && !defined(BSDI) && !defined(UNIXWARE) \
+ && !defined(DARWIN) && !defined(RISCOS)
+ PRIntn rv;
+ sigwait(&sigwait_set, &rv);
+#endif
+ }
+ me->suspend |= PT_THREAD_RESUMED;
+ pthread_cond_signal(&me->suspendResumeCV);
+#else /* defined(PT_NO_SIGTIMEDWAIT) */
+ while (me->suspend & PT_THREAD_SUSPENDED)
+ {
+ PRIntn rv = sigtimedwait(&sigwait_set, NULL, &hundredmillisec);
+ PR_ASSERT(-1 == rv);
+ }
+ me->suspend |= PT_THREAD_RESUMED;
+#endif
+
+ /*
+ * At this point, thread has been resumed, so set a global condition.
+ * The ResumeAll needs to know that this has really been resumed.
+ * So the signal handler sets a flag which PR_ResumeAll will reset.
+ * The PR_ResumeAll must reset this flag ...
+ */
+
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("End suspend_signal_handler thred = %p tid = %X\n", me, me->id));
+} /* suspend_signal_handler */
+
+static void pt_SuspendSet(PRThread *thred)
+{
+ PRIntn rv;
+
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("pt_SuspendSet thred %p thread id = %X\n", thred, thred->id));
+
+
+ /*
+ * Check the thread state and signal the thread to suspend
+ */
+
+ PR_ASSERT((thred->suspend & PT_THREAD_SUSPENDED) == 0);
+
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("doing pthread_kill in pt_SuspendSet thred %p tid = %X\n",
+ thred, thred->id));
+ rv = pthread_kill (thred->id, SIGUSR2);
+ PR_ASSERT(0 == rv);
+}
+
+static void pt_SuspendTest(PRThread *thred)
+{
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("Begin pt_SuspendTest thred %p thread id = %X\n", thred, thred->id));
+
+
+ /*
+ * Wait for the thread to be really suspended. This happens when the
+ * suspend signal handler stores the stack pointer and sets the state
+ * to suspended.
+ */
+
+#if defined(PT_NO_SIGTIMEDWAIT)
+ pthread_mutex_lock(&thred->suspendResumeMutex);
+ while ((thred->suspend & PT_THREAD_SUSPENDED) == 0)
+ {
+ pthread_cond_timedwait(
+ &thred->suspendResumeCV, &thred->suspendResumeMutex, &onemillisec);
+ }
+ pthread_mutex_unlock(&thred->suspendResumeMutex);
+#else
+ while ((thred->suspend & PT_THREAD_SUSPENDED) == 0)
+ {
+ PRIntn rv = sigtimedwait(&sigwait_set, NULL, &onemillisec);
+ PR_ASSERT(-1 == rv);
+ }
+#endif
+
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("End pt_SuspendTest thred %p tid %X\n", thred, thred->id));
+} /* pt_SuspendTest */
+
+static void pt_ResumeSet(PRThread *thred)
+{
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("pt_ResumeSet thred %p thread id = %X\n", thred, thred->id));
+
+ /*
+ * Clear the global state and set the thread state so that it will
+ * continue past yield loop in the suspend signal handler
+ */
+
+ PR_ASSERT(thred->suspend & PT_THREAD_SUSPENDED);
+
+
+ thred->suspend &= ~PT_THREAD_SUSPENDED;
+
+#if defined(PT_NO_SIGTIMEDWAIT)
+ pthread_kill(thred->id, SIGUSR1);
+#endif
+
+} /* pt_ResumeSet */
+
+static void pt_ResumeTest(PRThread *thred)
+{
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("Begin pt_ResumeTest thred %p thread id = %X\n", thred, thred->id));
+
+ /*
+ * Wait for the threads resume state to change
+ * to indicate it is really resumed
+ */
+#if defined(PT_NO_SIGTIMEDWAIT)
+ pthread_mutex_lock(&thred->suspendResumeMutex);
+ while ((thred->suspend & PT_THREAD_RESUMED) == 0)
+ {
+ pthread_cond_timedwait(
+ &thred->suspendResumeCV, &thred->suspendResumeMutex, &onemillisec);
+ }
+ pthread_mutex_unlock(&thred->suspendResumeMutex);
+#else
+ while ((thred->suspend & PT_THREAD_RESUMED) == 0) {
+ PRIntn rv = sigtimedwait(&sigwait_set, NULL, &onemillisec);
+ PR_ASSERT(-1 == rv);
+ }
+#endif
+
+ thred->suspend &= ~PT_THREAD_RESUMED;
+
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, (
+ "End pt_ResumeTest thred %p tid %X\n", thred, thred->id));
+} /* pt_ResumeTest */
+
+static pthread_once_t pt_gc_support_control = PTHREAD_ONCE_INIT;
+
+PR_IMPLEMENT(void) PR_SuspendAll(void)
+{
+#ifdef DEBUG
+ PRIntervalTime stime, etime;
+#endif
+ PRThread* thred = pt_book.first;
+ PRThread *me = PR_GetCurrentThread();
+ int rv;
+
+ rv = pthread_once(&pt_gc_support_control, init_pthread_gc_support);
+ PR_ASSERT(0 == rv);
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_SuspendAll\n"));
+ /*
+ * Stop all threads which are marked GC able.
+ */
+ PR_Lock(pt_book.ml);
+#ifdef DEBUG
+ suspendAllOn = PR_TRUE;
+ stime = PR_IntervalNow();
+#endif
+ while (thred != NULL)
+ {
+ if ((thred != me) && _PT_IS_GCABLE_THREAD(thred)) {
+ pt_SuspendSet(thred);
+ }
+ thred = thred->next;
+ }
+
+ /* Wait till they are really suspended */
+ thred = pt_book.first;
+ while (thred != NULL)
+ {
+ if ((thred != me) && _PT_IS_GCABLE_THREAD(thred)) {
+ pt_SuspendTest(thred);
+ }
+ thred = thred->next;
+ }
+
+ suspendAllSuspended = PR_TRUE;
+
+#ifdef DEBUG
+ etime = PR_IntervalNow();
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,\
+ ("End PR_SuspendAll (time %dms)\n",
+ PR_IntervalToMilliseconds(etime - stime)));
+#endif
+} /* PR_SuspendAll */
+
+PR_IMPLEMENT(void) PR_ResumeAll(void)
+{
+#ifdef DEBUG
+ PRIntervalTime stime, etime;
+#endif
+ PRThread* thred = pt_book.first;
+ PRThread *me = PR_GetCurrentThread();
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS, ("Begin PR_ResumeAll\n"));
+ /*
+ * Resume all previously suspended GC able threads.
+ */
+ suspendAllSuspended = PR_FALSE;
+#ifdef DEBUG
+ stime = PR_IntervalNow();
+#endif
+
+ while (thred != NULL)
+ {
+ if ((thred != me) && _PT_IS_GCABLE_THREAD(thred)) {
+ pt_ResumeSet(thred);
+ }
+ thred = thred->next;
+ }
+
+ thred = pt_book.first;
+ while (thred != NULL)
+ {
+ if ((thred != me) && _PT_IS_GCABLE_THREAD(thred)) {
+ pt_ResumeTest(thred);
+ }
+ thred = thred->next;
+ }
+
+ PR_Unlock(pt_book.ml);
+#ifdef DEBUG
+ suspendAllOn = PR_FALSE;
+ etime = PR_IntervalNow();
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("End PR_ResumeAll (time %dms)\n",
+ PR_IntervalToMilliseconds(etime - stime)));
+#endif
+} /* PR_ResumeAll */
+
+/* Return the stack pointer for the given thread- used by the GC */
+PR_IMPLEMENT(void *)PR_GetSP(PRThread *thred)
+{
+ PR_LOG(_pr_gc_lm, PR_LOG_ALWAYS,
+ ("in PR_GetSP thred %p thid = %X, sp = %p\n",
+ thred, thred->id, thred->sp));
+ return thred->sp;
+} /* PR_GetSP */
+
+PR_IMPLEMENT(PRStatus) PR_SetCurrentThreadName(const char *name)
+{
+ PRThread *thread;
+ size_t nameLen;
+ int result = 0;
+
+ if (!name) {
+ PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0);
+ return PR_FAILURE;
+ }
+
+ thread = PR_GetCurrentThread();
+ if (!thread) {
+ return PR_FAILURE;
+ }
+
+ PR_Free(thread->name);
+ nameLen = strlen(name);
+ thread->name = (char *)PR_Malloc(nameLen + 1);
+ if (!thread->name) {
+ return PR_FAILURE;
+ }
+ memcpy(thread->name, name, nameLen + 1);
+
+#if defined(OPENBSD) || defined(FREEBSD) || defined(DRAGONFLY)
+ pthread_set_name_np(thread->id, name);
+#elif defined(ANDROID)
+ prctl(PR_SET_NAME, (unsigned long)(name));
+#elif defined(NETBSD)
+ result = pthread_setname_np(thread->id, "%s", (void *)name);
+#else /* not BSD */
+ /*
+ * On OSX, pthread_setname_np is only available in 10.6 or later, so test
+ * for it at runtime. It also may not be available on all linux distros.
+ */
+#if defined(DARWIN)
+ int (*dynamic_pthread_setname_np)(const char*);
+#else
+ int (*dynamic_pthread_setname_np)(pthread_t, const char*);
+#endif
+
+ *(void**)(&dynamic_pthread_setname_np) =
+ dlsym(RTLD_DEFAULT, "pthread_setname_np");
+ if (!dynamic_pthread_setname_np) {
+ return PR_SUCCESS;
+ }
+
+#if defined(DARWIN)
+ /* Mac OS X has a length limit of 63 characters, but there is no API
+ * exposing it.
+ */
+#define SETNAME_LENGTH_CONSTRAINT 63
+#else
+ /*
+ * The 15-character name length limit is an experimentally determined
+ * length of a null-terminated string that most linux distros accept
+ * as an argument to pthread_setname_np. Otherwise the E2BIG
+ * error is returned by the function.
+ */
+#define SETNAME_LENGTH_CONSTRAINT 15
+#endif
+#define SETNAME_FRAGMENT1_LENGTH (SETNAME_LENGTH_CONSTRAINT >> 1)
+#define SETNAME_FRAGMENT2_LENGTH \
+ (SETNAME_LENGTH_CONSTRAINT - SETNAME_FRAGMENT1_LENGTH - 1)
+ char name_dup[SETNAME_LENGTH_CONSTRAINT + 1];
+ if (nameLen > SETNAME_LENGTH_CONSTRAINT) {
+ memcpy(name_dup, name, SETNAME_FRAGMENT1_LENGTH);
+ name_dup[SETNAME_FRAGMENT1_LENGTH] = '~';
+ /* Note that this also copies the null terminator. */
+ memcpy(name_dup + SETNAME_FRAGMENT1_LENGTH + 1,
+ name + nameLen - SETNAME_FRAGMENT2_LENGTH,
+ SETNAME_FRAGMENT2_LENGTH + 1);
+ name = name_dup;
+ }
+
+#if defined(DARWIN)
+ result = dynamic_pthread_setname_np(name);
+#else
+ result = dynamic_pthread_setname_np(thread->id, name);
+#endif
+#endif /* not BSD */
+
+ if (result) {
+ PR_SetError(PR_UNKNOWN_ERROR, result);
+ return PR_FAILURE;
+ }
+ return PR_SUCCESS;
+}
+
+PR_IMPLEMENT(const char *) PR_GetThreadName(const PRThread *thread)
+{
+ if (!thread) {
+ return NULL;
+ }
+ return thread->name;
+}
+
+#endif /* defined(_PR_PTHREADS) */
+
+/* ptthread.c */