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-rw-r--r--libnetdata/threads/Makefile.am8
-rw-r--r--libnetdata/threads/README.md5
-rw-r--r--libnetdata/threads/threads.c267
-rw-r--r--libnetdata/threads/threads.h49
4 files changed, 329 insertions, 0 deletions
diff --git a/libnetdata/threads/Makefile.am b/libnetdata/threads/Makefile.am
new file mode 100644
index 0000000..161784b
--- /dev/null
+++ b/libnetdata/threads/Makefile.am
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+dist_noinst_DATA = \
+ README.md \
+ $(NULL)
diff --git a/libnetdata/threads/README.md b/libnetdata/threads/README.md
new file mode 100644
index 0000000..75ab11b
--- /dev/null
+++ b/libnetdata/threads/README.md
@@ -0,0 +1,5 @@
+<!--
+custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/threads/README.md
+-->
+
+
diff --git a/libnetdata/threads/threads.c b/libnetdata/threads/threads.c
new file mode 100644
index 0000000..5c3d267
--- /dev/null
+++ b/libnetdata/threads/threads.c
@@ -0,0 +1,267 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "../libnetdata.h"
+
+static size_t default_stacksize = 0, wanted_stacksize = 0;
+static pthread_attr_t *attr = NULL;
+
+// ----------------------------------------------------------------------------
+// per thread data
+
+typedef struct {
+ void *arg;
+ pthread_t *thread;
+ const char *tag;
+ void *(*start_routine) (void *);
+ NETDATA_THREAD_OPTIONS options;
+} NETDATA_THREAD;
+
+static __thread NETDATA_THREAD *netdata_thread = NULL;
+
+inline int netdata_thread_tag_exists(void) {
+ return (netdata_thread && netdata_thread->tag && *netdata_thread->tag);
+}
+
+const char *netdata_thread_tag(void) {
+ return (netdata_thread_tag_exists() ? netdata_thread->tag : "MAIN");
+}
+
+// ----------------------------------------------------------------------------
+// compatibility library functions
+
+static __thread pid_t gettid_cached_tid = 0;
+pid_t gettid(void) {
+ pid_t tid = 0;
+
+ if(likely(gettid_cached_tid > 0))
+ return gettid_cached_tid;
+
+#ifdef __FreeBSD__
+
+ tid = (pid_t)pthread_getthreadid_np();
+
+#elif defined(__APPLE__)
+
+ #if (defined __MAC_OS_X_VERSION_MIN_REQUIRED && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1060)
+ uint64_t curthreadid;
+ pthread_threadid_np(NULL, &curthreadid);
+ tid = (pid_t)curthreadid;
+ #else /* __MAC_OS_X_VERSION_MIN_REQUIRED */
+ tid = (pid_t)pthread_self;
+ #endif /* __MAC_OS_X_VERSION_MIN_REQUIRED */
+
+#else /* __APPLE__*/
+
+ tid = (pid_t)syscall(SYS_gettid);
+
+#endif /* __FreeBSD__, __APPLE__*/
+
+ gettid_cached_tid = tid;
+ return tid;
+}
+
+// ----------------------------------------------------------------------------
+// early initialization
+
+size_t netdata_threads_init(void) {
+ int i;
+
+ // --------------------------------------------------------------------
+ // get the required stack size of the threads of netdata
+
+ attr = callocz(1, sizeof(pthread_attr_t));
+ i = pthread_attr_init(attr);
+ if(i != 0)
+ fatal("pthread_attr_init() failed with code %d.", i);
+
+ i = pthread_attr_getstacksize(attr, &default_stacksize);
+ if(i != 0)
+ fatal("pthread_attr_getstacksize() failed with code %d.", i);
+ else
+ debug(D_OPTIONS, "initial pthread stack size is %zu bytes", default_stacksize);
+
+ return default_stacksize;
+}
+
+// ----------------------------------------------------------------------------
+// late initialization
+
+void netdata_threads_init_after_fork(size_t stacksize) {
+ wanted_stacksize = stacksize;
+ int i;
+
+ // ------------------------------------------------------------------------
+ // set default pthread stack size
+
+ if(attr && default_stacksize < wanted_stacksize && wanted_stacksize > 0) {
+ i = pthread_attr_setstacksize(attr, wanted_stacksize);
+ if(i != 0)
+ fatal("pthread_attr_setstacksize() to %zu bytes, failed with code %d.", wanted_stacksize, i);
+ else
+ debug(D_SYSTEM, "Successfully set pthread stacksize to %zu bytes", wanted_stacksize);
+ }
+}
+
+
+// ----------------------------------------------------------------------------
+// netdata_thread_create
+
+extern void rrdset_thread_rda_free(void);
+extern void sender_thread_buffer_free(void);
+extern void query_target_free(void);
+
+static void thread_cleanup(void *ptr) {
+ if(netdata_thread != ptr) {
+ NETDATA_THREAD *info = (NETDATA_THREAD *)ptr;
+ error("THREADS: internal error - thread local variable does not match the one passed to this function. Expected thread '%s', passed thread '%s'", netdata_thread->tag, info->tag);
+ }
+
+ if(!(netdata_thread->options & NETDATA_THREAD_OPTION_DONT_LOG_CLEANUP))
+ info("thread with task id %d finished", gettid());
+
+ sender_thread_buffer_free();
+ rrdset_thread_rda_free();
+ query_target_free();
+ thread_cache_destroy();
+
+ freez((void *)netdata_thread->tag);
+ netdata_thread->tag = NULL;
+
+ freez(netdata_thread);
+ netdata_thread = NULL;
+}
+
+static void thread_set_name_np(NETDATA_THREAD *nt) {
+
+ if (nt->tag) {
+ int ret = 0;
+
+ char threadname[NETDATA_THREAD_NAME_MAX+1];
+ strncpyz(threadname, nt->tag, NETDATA_THREAD_NAME_MAX);
+
+#if defined(__FreeBSD__)
+ pthread_set_name_np(pthread_self(), threadname);
+#elif defined(__APPLE__)
+ ret = pthread_setname_np(threadname);
+#else
+ ret = pthread_setname_np(pthread_self(), threadname);
+#endif
+
+ if (ret != 0)
+ error("cannot set pthread name of %d to %s. ErrCode: %d", gettid(), threadname, ret);
+ else
+ info("set name of thread %d to %s", gettid(), threadname);
+
+ }
+}
+
+void uv_thread_set_name_np(uv_thread_t ut, const char* name) {
+ int ret = 0;
+
+ char threadname[NETDATA_THREAD_NAME_MAX+1];
+ strncpyz(threadname, name, NETDATA_THREAD_NAME_MAX);
+
+#if defined(__FreeBSD__)
+ pthread_set_name_np(ut, threadname);
+#elif defined(__APPLE__)
+ // Apple can only set its own name
+ UNUSED(ut);
+#else
+ ret = pthread_setname_np(ut, threadname);
+#endif
+
+ if (ret)
+ info("cannot set libuv thread name to %s. Err: %d", threadname, ret);
+}
+
+void os_thread_get_current_name_np(char threadname[NETDATA_THREAD_NAME_MAX + 1])
+{
+ threadname[0] = '\0';
+#if defined(__FreeBSD__)
+ pthread_get_name_np(pthread_self(), threadname, NETDATA_THREAD_NAME_MAX + 1);
+#elif defined(HAVE_PTHREAD_GETNAME_NP) /* Linux & macOS */
+ (void)pthread_getname_np(pthread_self(), threadname, NETDATA_THREAD_NAME_MAX + 1);
+#endif
+}
+
+static void *thread_start(void *ptr) {
+ netdata_thread = (NETDATA_THREAD *)ptr;
+
+ if(!(netdata_thread->options & NETDATA_THREAD_OPTION_DONT_LOG_STARTUP))
+ info("thread created with task id %d", gettid());
+
+ if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
+ error("cannot set pthread cancel type to DEFERRED.");
+
+ if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
+ error("cannot set pthread cancel state to ENABLE.");
+
+ thread_set_name_np(ptr);
+
+ void *ret = NULL;
+ pthread_cleanup_push(thread_cleanup, ptr);
+ ret = netdata_thread->start_routine(netdata_thread->arg);
+ pthread_cleanup_pop(1);
+
+ return ret;
+}
+
+int netdata_thread_create(netdata_thread_t *thread, const char *tag, NETDATA_THREAD_OPTIONS options, void *(*start_routine) (void *), void *arg) {
+ NETDATA_THREAD *info = mallocz(sizeof(NETDATA_THREAD));
+ info->arg = arg;
+ info->thread = thread;
+ info->tag = strdupz(tag);
+ info->start_routine = start_routine;
+ info->options = options;
+
+ int ret = pthread_create(thread, attr, thread_start, info);
+ if(ret != 0)
+ error("failed to create new thread for %s. pthread_create() failed with code %d", tag, ret);
+
+ else {
+ if (!(options & NETDATA_THREAD_OPTION_JOINABLE)) {
+ int ret2 = pthread_detach(*thread);
+ if (ret2 != 0)
+ error("cannot request detach of newly created %s thread. pthread_detach() failed with code %d", tag, ret2);
+ }
+ }
+
+ return ret;
+}
+
+// ----------------------------------------------------------------------------
+// netdata_thread_cancel
+#ifdef NETDATA_INTERNAL_CHECKS
+int netdata_thread_cancel_with_trace(netdata_thread_t thread, int line, const char *file, const char *function) {
+#else
+int netdata_thread_cancel(netdata_thread_t thread) {
+#endif
+ int ret = pthread_cancel(thread);
+ if(ret != 0)
+#ifdef NETDATA_INTERNAL_CHECKS
+ error("cannot cancel thread. pthread_cancel() failed with code %d at %d@%s, function %s()", ret, line, file, function);
+#else
+ error("cannot cancel thread. pthread_cancel() failed with code %d.", ret);
+#endif
+
+ return ret;
+}
+
+// ----------------------------------------------------------------------------
+// netdata_thread_join
+
+int netdata_thread_join(netdata_thread_t thread, void **retval) {
+ int ret = pthread_join(thread, retval);
+ if(ret != 0)
+ error("cannot join thread. pthread_join() failed with code %d.", ret);
+
+ return ret;
+}
+
+int netdata_thread_detach(pthread_t thread) {
+ int ret = pthread_detach(thread);
+ if(ret != 0)
+ error("cannot detach thread. pthread_detach() failed with code %d.", ret);
+
+ return ret;
+}
diff --git a/libnetdata/threads/threads.h b/libnetdata/threads/threads.h
new file mode 100644
index 0000000..ccc18af
--- /dev/null
+++ b/libnetdata/threads/threads.h
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_THREADS_H
+#define NETDATA_THREADS_H 1
+
+#include "../libnetdata.h"
+
+pid_t gettid(void);
+
+typedef enum {
+ NETDATA_THREAD_OPTION_DEFAULT = 0 << 0,
+ NETDATA_THREAD_OPTION_JOINABLE = 1 << 0,
+ NETDATA_THREAD_OPTION_DONT_LOG_STARTUP = 1 << 1,
+ NETDATA_THREAD_OPTION_DONT_LOG_CLEANUP = 1 << 2,
+ NETDATA_THREAD_OPTION_DONT_LOG = NETDATA_THREAD_OPTION_DONT_LOG_STARTUP|NETDATA_THREAD_OPTION_DONT_LOG_CLEANUP,
+} NETDATA_THREAD_OPTIONS;
+
+#define netdata_thread_cleanup_push(func, arg) pthread_cleanup_push(func, arg)
+#define netdata_thread_cleanup_pop(execute) pthread_cleanup_pop(execute)
+
+typedef pthread_t netdata_thread_t;
+
+#define NETDATA_THREAD_TAG_MAX 100
+const char *netdata_thread_tag(void);
+int netdata_thread_tag_exists(void);
+
+size_t netdata_threads_init(void);
+void netdata_threads_init_after_fork(size_t stacksize);
+
+int netdata_thread_create(netdata_thread_t *thread, const char *tag, NETDATA_THREAD_OPTIONS options, void *(*start_routine) (void *), void *arg);
+
+#ifdef NETDATA_INTERNAL_CHECKS
+#define netdata_thread_cancel(thread) netdata_thread_cancel_with_trace(thread, __LINE__, __FILE__, __FUNCTION__)
+int netdata_thread_cancel_with_trace(netdata_thread_t thread, int line, const char *file, const char *function);
+#else
+int netdata_thread_cancel(netdata_thread_t thread);
+#endif
+
+int netdata_thread_join(netdata_thread_t thread, void **retval);
+int netdata_thread_detach(pthread_t thread);
+
+#define NETDATA_THREAD_NAME_MAX 15
+void uv_thread_set_name_np(uv_thread_t ut, const char* name);
+void os_thread_get_current_name_np(char threadname[NETDATA_THREAD_NAME_MAX + 1]);
+
+#define netdata_thread_self pthread_self
+#define netdata_thread_testcancel pthread_testcancel
+
+#endif //NETDATA_THREADS_H
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