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Diffstat (limited to 'include/my_pthread.h')
| -rw-r--r-- | include/my_pthread.h | 812 |
1 files changed, 812 insertions, 0 deletions
diff --git a/include/my_pthread.h b/include/my_pthread.h new file mode 100644 index 00000000..ee4cd15b --- /dev/null +++ b/include/my_pthread.h @@ -0,0 +1,812 @@ +/* Copyright (c) 2000, 2014, Oracle and/or its affiliates. + Copyright (c) 2009, 2020, MariaDB Corporation. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ + +/* Defines to make different thread packages compatible */ + +#ifndef _my_pthread_h +#define _my_pthread_h + +#ifndef ETIME +#define ETIME ETIMEDOUT /* For FreeBSD */ +#endif + +#ifdef __cplusplus +#define EXTERNC extern "C" +extern "C" { +#else +#define EXTERNC +#endif /* __cplusplus */ + +#if defined(__WIN__) +typedef CRITICAL_SECTION pthread_mutex_t; +typedef DWORD pthread_t; +typedef struct thread_attr { + DWORD dwStackSize ; + DWORD dwCreatingFlag ; +} pthread_attr_t ; + +typedef struct { int dummy; } pthread_condattr_t; + +/* Implementation of posix conditions */ + +typedef struct st_pthread_link { + DWORD thread_id; + struct st_pthread_link *next; +} pthread_link; + +/** + Implementation of Windows condition variables. + We use native conditions on Vista and later, and fallback to own + implementation on earlier OS version. +*/ +typedef CONDITION_VARIABLE pthread_cond_t; + + +typedef int pthread_mutexattr_t; +#define pthread_self() GetCurrentThreadId() +#define pthread_handler_t EXTERNC void * __cdecl +typedef void * (__cdecl *pthread_handler)(void *); + +typedef INIT_ONCE my_pthread_once_t; +#define MY_PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT; + +#if !STRUCT_TIMESPEC_HAS_TV_SEC || !STRUCT_TIMESPEC_HAS_TV_NSEC +struct timespec { + time_t tv_sec; + long tv_nsec; +}; +#endif + +int win_pthread_mutex_trylock(pthread_mutex_t *mutex); +int pthread_create(pthread_t *, const pthread_attr_t *, pthread_handler, void *); +int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr); +int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex); +int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, + const struct timespec *abstime); +int pthread_cond_signal(pthread_cond_t *cond); +int pthread_cond_broadcast(pthread_cond_t *cond); +int pthread_cond_destroy(pthread_cond_t *cond); +int pthread_attr_init(pthread_attr_t *connect_att); +int pthread_attr_setstacksize(pthread_attr_t *connect_att,size_t stack); +int pthread_attr_destroy(pthread_attr_t *connect_att); +int my_pthread_once(my_pthread_once_t *once_control,void (*init_routine)(void)); + +static inline struct tm *localtime_r(const time_t *timep, struct tm *tmp) +{ + localtime_s(tmp, timep); + return tmp; +} + +static inline struct tm *gmtime_r(const time_t *clock, struct tm *res) +{ + gmtime_s(res, clock); + return res; +} + +void pthread_exit(void *a); +int pthread_join(pthread_t thread, void **value_ptr); +int pthread_cancel(pthread_t thread); + +#ifndef ETIMEDOUT +#define ETIMEDOUT 145 /* Win32 doesn't have this */ +#endif + +#define getpid() GetCurrentThreadId() +#define HAVE_LOCALTIME_R 1 +#define _REENTRANT 1 +#define HAVE_PTHREAD_ATTR_SETSTACKSIZE 1 + +#undef SAFE_MUTEX /* This will cause conflicts */ +#define pthread_key(T,V) DWORD V +#define pthread_key_create(A,B) ((*A=TlsAlloc())==0xFFFFFFFF) +#define pthread_key_delete(A) TlsFree(A) +#define my_pthread_setspecific_ptr(T,V) (!TlsSetValue((T),(V))) +#define pthread_setspecific(A,B) (!TlsSetValue((A),(LPVOID)(B))) +#define pthread_getspecific(A) (TlsGetValue(A)) +#define my_pthread_getspecific(T,A) ((T) TlsGetValue(A)) +#define my_pthread_getspecific_ptr(T,V) ((T) TlsGetValue(V)) + +#define pthread_equal(A,B) ((A) == (B)) +#define pthread_mutex_init(A,B) (InitializeCriticalSection(A),0) +#define pthread_mutex_lock(A) (EnterCriticalSection(A),0) +#define pthread_mutex_trylock(A) win_pthread_mutex_trylock((A)) +#define pthread_mutex_unlock(A) (LeaveCriticalSection(A), 0) +#define pthread_mutex_destroy(A) (DeleteCriticalSection(A), 0) +#define pthread_kill(A,B) pthread_dummy((A) ? 0 : ESRCH) + + +/* Dummy defines for easier code */ +#define pthread_attr_setdetachstate(A,B) pthread_dummy(0) +#define pthread_attr_setscope(A,B) +#define pthread_detach_this_thread() +#define pthread_condattr_init(A) +#define pthread_condattr_destroy(A) +#define pthread_yield() SwitchToThread() +#define my_sigset(A,B) signal(A,B) + +#else /* Normal threads */ + +#ifdef HAVE_rts_threads +#define sigwait org_sigwait +#include <signal.h> +#undef sigwait +#endif +#include <pthread.h> +#ifndef _REENTRANT +#define _REENTRANT +#endif +#ifdef HAVE_THR_SETCONCURRENCY +#include <thread.h> /* Probably solaris */ +#endif +#ifdef HAVE_SCHED_H +#include <sched.h> +#endif +#ifdef HAVE_SYNCH_H +#include <synch.h> +#endif + +#define pthread_key(T,V) pthread_key_t V +#define my_pthread_getspecific_ptr(T,V) my_pthread_getspecific(T,(V)) +#define my_pthread_setspecific_ptr(T,V) pthread_setspecific(T,(void*) (V)) +#define pthread_detach_this_thread() +#define pthread_handler_t EXTERNC void * +typedef void *(* pthread_handler)(void *); + +#define my_pthread_once_t pthread_once_t +#if defined(PTHREAD_ONCE_INITIALIZER) +#define MY_PTHREAD_ONCE_INIT PTHREAD_ONCE_INITIALIZER +#else +#define MY_PTHREAD_ONCE_INIT PTHREAD_ONCE_INIT +#endif +#define my_pthread_once(C,F) pthread_once(C,F) + +/* Test first for RTS or FSU threads */ + +#if defined(PTHREAD_SCOPE_GLOBAL) && !defined(PTHREAD_SCOPE_SYSTEM) +#define HAVE_rts_threads +extern int my_pthread_create_detached; +#define pthread_sigmask(A,B,C) sigprocmask((A),(B),(C)) +#define PTHREAD_CREATE_DETACHED &my_pthread_create_detached +#define PTHREAD_SCOPE_SYSTEM PTHREAD_SCOPE_GLOBAL +#define PTHREAD_SCOPE_PROCESS PTHREAD_SCOPE_LOCAL +#define USE_ALARM_THREAD +#endif /* defined(PTHREAD_SCOPE_GLOBAL) && !defined(PTHREAD_SCOPE_SYSTEM) */ + +#if defined(_BSDI_VERSION) && _BSDI_VERSION < 199910 +int sigwait(sigset_t *set, int *sig); +#endif + +static inline int my_sigwait(sigset_t *set, int *sig, int *code) +{ +#ifdef HAVE_SIGWAITINFO + siginfo_t siginfo; + *sig= sigwaitinfo(set, &siginfo); + *code= siginfo.si_code; + return *sig < 0 ? errno : 0; +#else + *code= 0; + return sigwait(set, sig); +#endif +} + +#if defined(HAVE_SIGTHREADMASK) && !defined(HAVE_PTHREAD_SIGMASK) +#define pthread_sigmask(A,B,C) sigthreadmask((A),(B),(C)) +#endif + +#if !defined(HAVE_SIGWAIT) && !defined(HAVE_rts_threads) && !defined(sigwait) && !defined(alpha_linux_port) && !defined(_AIX) +int sigwait(sigset_t *setp, int *sigp); /* Use our implementation */ +#endif + + +/* + We define my_sigset() and use that instead of the system sigset() so that + we can favor an implementation based on sigaction(). On some systems, such + as Mac OS X, sigset() results in flags such as SA_RESTART being set, and + we want to make sure that no such flags are set. +*/ +#if defined(HAVE_SIGACTION) && !defined(my_sigset) +#define my_sigset(A,B) do { struct sigaction l_s; sigset_t l_set; \ + DBUG_ASSERT((A) != 0); \ + sigemptyset(&l_set); \ + l_s.sa_handler = (B); \ + l_s.sa_mask = l_set; \ + l_s.sa_flags = 0; \ + sigaction((A), &l_s, NULL); \ + } while (0) +#elif defined(HAVE_SIGSET) && !defined(my_sigset) +#define my_sigset(A,B) sigset((A),(B)) +#elif !defined(my_sigset) +#define my_sigset(A,B) signal((A),(B)) +#endif + +#if !defined(HAVE_PTHREAD_ATTR_SETSCOPE) +#define pthread_attr_setscope(A,B) +#undef HAVE_GETHOSTBYADDR_R /* No definition */ +#endif + +#define my_pthread_getspecific(A,B) ((A) pthread_getspecific(B)) + +#ifndef HAVE_LOCALTIME_R +struct tm *localtime_r(const time_t *clock, struct tm *res); +#endif + +#ifndef HAVE_GMTIME_R +struct tm *gmtime_r(const time_t *clock, struct tm *res); +#endif + +#ifdef HAVE_PTHREAD_CONDATTR_CREATE +/* DCE threads on HPUX 10.20 */ +#define pthread_condattr_init pthread_condattr_create +#define pthread_condattr_destroy pthread_condattr_delete +#endif + +/* FSU THREADS */ +#if !defined(HAVE_PTHREAD_KEY_DELETE) && !defined(pthread_key_delete) +#define pthread_key_delete(A) pthread_dummy(0) +#endif + +#if defined(HAVE_PTHREAD_ATTR_CREATE) && !defined(HAVE_SIGWAIT) +/* This is set on AIX_3_2 and Siemens unix (and DEC OSF/1 3.2 too) */ +#define pthread_key_create(A,B) \ + pthread_keycreate(A,(B) ?\ + (pthread_destructor_t) (B) :\ + (pthread_destructor_t) pthread_dummy) +#define pthread_attr_init(A) pthread_attr_create(A) +#define pthread_attr_destroy(A) pthread_attr_delete(A) +#define pthread_attr_setdetachstate(A,B) pthread_dummy(0) +#define pthread_create(A,B,C,D) pthread_create((A),*(B),(C),(D)) +#ifndef pthread_sigmask +#define pthread_sigmask(A,B,C) sigprocmask((A),(B),(C)) +#endif +#define pthread_kill(A,B) pthread_dummy((A) ? 0 : ESRCH) +#undef pthread_detach_this_thread +#define pthread_detach_this_thread() { pthread_t tmp=pthread_self() ; pthread_detach(&tmp); } +#else /* HAVE_PTHREAD_ATTR_CREATE && !HAVE_SIGWAIT */ +#define HAVE_PTHREAD_KILL 1 +#endif + +#endif /* defined(__WIN__) */ + +#if defined(HPUX10) && !defined(DONT_REMAP_PTHREAD_FUNCTIONS) +#undef pthread_cond_timedwait +#define pthread_cond_timedwait(a,b,c) my_pthread_cond_timedwait((a),(b),(c)) +int my_pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, + struct timespec *abstime); +#endif + +#if defined(HPUX10) +#define pthread_attr_getstacksize(A,B) my_pthread_attr_getstacksize(A,B) +void my_pthread_attr_getstacksize(pthread_attr_t *attrib, size_t *size); +#endif + +#if defined(HAVE_POSIX1003_4a_MUTEX) && !defined(DONT_REMAP_PTHREAD_FUNCTIONS) +#undef pthread_mutex_trylock +#define pthread_mutex_trylock(a) my_pthread_mutex_trylock((a)) +int my_pthread_mutex_trylock(pthread_mutex_t *mutex); +#endif + +#if !defined(HAVE_PTHREAD_YIELD_ZERO_ARG) +/* no pthread_yield() available */ +#ifdef HAVE_SCHED_YIELD +#define pthread_yield() sched_yield() +#elif defined(HAVE_PTHREAD_YIELD_NP) /* can be Mac OS X */ +#define pthread_yield() pthread_yield_np() +#elif defined(HAVE_THR_YIELD) +#define pthread_yield() thr_yield() +#endif +#endif + +size_t my_setstacksize(pthread_attr_t *attr, size_t stacksize); + +/* + The defines set_timespec and set_timespec_nsec should be used + for calculating an absolute time at which + pthread_cond_timedwait should timeout +*/ +#define set_timespec(ABSTIME,SEC) set_timespec_nsec((ABSTIME),(SEC)*1000000000ULL) + +#ifndef set_timespec_nsec +#define set_timespec_nsec(ABSTIME,NSEC) \ + set_timespec_time_nsec((ABSTIME), my_hrtime_coarse().val*1000 + (NSEC)) +#endif /* !set_timespec_nsec */ + +/* adapt for two different flavors of struct timespec */ +#ifdef HAVE_TIMESPEC_TS_SEC +#define MY_tv_sec ts_sec +#define MY_tv_nsec ts_nsec +#else +#define MY_tv_sec tv_sec +#define MY_tv_nsec tv_nsec +#endif /* HAVE_TIMESPEC_TS_SEC */ + +/** + Compare two timespec structs. + + @retval 1 If TS1 ends after TS2. + + @retval 0 If TS1 is equal to TS2. + + @retval -1 If TS1 ends before TS2. +*/ +#ifndef cmp_timespec +#define cmp_timespec(TS1, TS2) \ + ((TS1.MY_tv_sec > TS2.MY_tv_sec || \ + (TS1.MY_tv_sec == TS2.MY_tv_sec && TS1.MY_tv_nsec > TS2.MY_tv_nsec)) ? 1 : \ + ((TS1.MY_tv_sec < TS2.MY_tv_sec || \ + (TS1.MY_tv_sec == TS2.MY_tv_sec && TS1.MY_tv_nsec < TS2.MY_tv_nsec)) ? -1 : 0)) +#endif /* !cmp_timespec */ + +#ifndef set_timespec_time_nsec +#define set_timespec_time_nsec(ABSTIME,NSEC) do { \ + ulonglong _now_= (NSEC); \ + (ABSTIME).MY_tv_sec= (time_t) (_now_ / 1000000000ULL); \ + (ABSTIME).MY_tv_nsec= (ulong) (_now_ % 1000000000UL); \ +} while(0) +#endif /* !set_timespec_time_nsec */ + +#ifdef MYSQL_CLIENT +#define _current_thd() NULL +#else +MYSQL_THD _current_thd(); +#endif + +/* safe_mutex adds checking to mutex for easier debugging */ +struct st_hash; +typedef struct st_safe_mutex_t +{ + pthread_mutex_t global,mutex; + const char *file, *name; + uint line,count; + myf create_flags, active_flags; + ulong id; + pthread_t thread; + struct st_hash *locked_mutex, *used_mutex; + struct st_safe_mutex_t *prev, *next; +#ifdef SAFE_MUTEX_DETECT_DESTROY + struct st_safe_mutex_info_t *info; /* to track destroying of mutexes */ +#endif +} safe_mutex_t; + +typedef struct st_safe_mutex_deadlock_t +{ + const char *file, *name; + safe_mutex_t *mutex; + uint line; + ulong count; + ulong id; + my_bool warning_only; +} safe_mutex_deadlock_t; + +#ifdef SAFE_MUTEX_DETECT_DESTROY +/* + Used to track the destroying of mutexes. This needs to be a separate + structure because the safe_mutex_t structure could be freed before + the mutexes are destroyed. +*/ + +typedef struct st_safe_mutex_info_t +{ + struct st_safe_mutex_info_t *next; + struct st_safe_mutex_info_t *prev; + const char *init_file; + uint32 init_line; +} safe_mutex_info_t; +#endif /* SAFE_MUTEX_DETECT_DESTROY */ + +int safe_mutex_init(safe_mutex_t *mp, const pthread_mutexattr_t *attr, + const char *name, const char *file, uint line); +int safe_mutex_lock(safe_mutex_t *mp, myf my_flags, const char *file, + uint line); +int safe_mutex_unlock(safe_mutex_t *mp,const char *file, uint line); +int safe_mutex_destroy(safe_mutex_t *mp,const char *file, uint line); +int safe_cond_wait(pthread_cond_t *cond, safe_mutex_t *mp,const char *file, + uint line); +int safe_cond_timedwait(pthread_cond_t *cond, safe_mutex_t *mp, + const struct timespec *abstime, + const char *file, uint line); +void safe_mutex_global_init(void); +void safe_mutex_end(FILE *file); +void safe_mutex_free_deadlock_data(safe_mutex_t *mp); + + /* Wrappers if safe mutex is actually used */ +#define MYF_TRY_LOCK 1 +#define MYF_NO_DEADLOCK_DETECTION 2 + +#ifdef SAFE_MUTEX +#define safe_mutex_is_owner(mp) ((mp)->count > 0 && \ + pthread_equal(pthread_self(), (mp)->thread)) +#define safe_mutex_assert_owner(mp) DBUG_ASSERT(safe_mutex_is_owner(mp)) +#define safe_mutex_assert_not_owner(mp) DBUG_ASSERT(!safe_mutex_is_owner(mp)) +#define safe_mutex_setflags(mp, F) do { (mp)->create_flags|= (F); } while (0) +#define my_cond_timedwait(A,B,C) safe_cond_timedwait((A),(B),(C),__FILE__,__LINE__) +#define my_cond_wait(A,B) safe_cond_wait((A), (B), __FILE__, __LINE__) +#else + +#define safe_mutex_assert_owner(mp) do {} while (0) +#define safe_mutex_assert_not_owner(mp) do {} while (0) +#define safe_mutex_setflags(mp, F) do {} while (0) + +#define my_cond_timedwait(A,B,C) pthread_cond_timedwait((A),(B),(C)) +#define my_cond_wait(A,B) pthread_cond_wait((A), (B)) +#endif /* !SAFE_MUTEX */ + + /* READ-WRITE thread locking */ + +#if defined(USE_MUTEX_INSTEAD_OF_RW_LOCKS) +/* use these defs for simple mutex locking */ +#define rw_lock_t pthread_mutex_t +#define my_rwlock_init(A,B) pthread_mutex_init((A),(B)) +#define rw_rdlock(A) pthread_mutex_lock((A)) +#define rw_wrlock(A) pthread_mutex_lock((A)) +#define rw_tryrdlock(A) pthread_mutex_trylock((A)) +#define rw_trywrlock(A) pthread_mutex_trylock((A)) +#define rw_unlock(A) pthread_mutex_unlock((A)) +#define rwlock_destroy(A) pthread_mutex_destroy((A)) +#elif defined(HAVE_PTHREAD_RWLOCK_RDLOCK) +#define rw_lock_t pthread_rwlock_t +#define my_rwlock_init(A,B) pthread_rwlock_init((A),(B)) +#define rw_rdlock(A) pthread_rwlock_rdlock(A) +#define rw_wrlock(A) pthread_rwlock_wrlock(A) +#define rw_tryrdlock(A) pthread_rwlock_tryrdlock((A)) +#define rw_trywrlock(A) pthread_rwlock_trywrlock((A)) +#define rw_unlock(A) pthread_rwlock_unlock(A) +#define rwlock_destroy(A) pthread_rwlock_destroy(A) +#elif defined(HAVE_RWLOCK_INIT) +#ifdef HAVE_RWLOCK_T /* For example Solaris 2.6-> */ +#define rw_lock_t rwlock_t +#endif +#define my_rwlock_init(A,B) rwlock_init((A),USYNC_THREAD,0) +#else +/* Use our own version of read/write locks */ +#define NEED_MY_RW_LOCK 1 +#define rw_lock_t my_rw_lock_t +#define my_rwlock_init(A,B) my_rw_init((A)) +#define rw_rdlock(A) my_rw_rdlock((A)) +#define rw_wrlock(A) my_rw_wrlock((A)) +#define rw_tryrdlock(A) my_rw_tryrdlock((A)) +#define rw_trywrlock(A) my_rw_trywrlock((A)) +#define rw_unlock(A) my_rw_unlock((A)) +#define rwlock_destroy(A) my_rw_destroy((A)) +#define rw_lock_assert_write_owner(A) my_rw_lock_assert_write_owner((A)) +#define rw_lock_assert_not_write_owner(A) my_rw_lock_assert_not_write_owner((A)) +#endif /* USE_MUTEX_INSTEAD_OF_RW_LOCKS */ + + +/** + Portable implementation of special type of read-write locks. + + These locks have two properties which are unusual for rwlocks: + 1) They "prefer readers" in the sense that they do not allow + situations in which rwlock is rd-locked and there is a + pending rd-lock which is blocked (e.g. due to pending + request for wr-lock). + This is a stronger guarantee than one which is provided for + PTHREAD_RWLOCK_PREFER_READER_NP rwlocks in Linux. + MDL subsystem deadlock detector relies on this property for + its correctness. + 2) They are optimized for uncontended wr-lock/unlock case. + This is a scenario in which they are most often used + within MDL subsystem. Optimizing for it gives significant + performance improvements in some of the tests involving many + connections. + + Another important requirement imposed on this type of rwlock + by the MDL subsystem is that it should be OK to destroy rwlock + object which is in unlocked state even though some threads might + have not yet fully left unlock operation for it (of course there + is an external guarantee that no thread will try to lock rwlock + which is destroyed). + Putting it another way the unlock operation should not access + rwlock data after changing its state to unlocked. + + TODO/FIXME: We should consider alleviating this requirement as + it blocks us from doing certain performance optimizations. +*/ + +typedef struct st_rw_pr_lock_t { + /** + Lock which protects the structure. + Also held for the duration of wr-lock. + */ + pthread_mutex_t lock; + /** + Condition variable which is used to wake-up + writers waiting for readers to go away. + */ + pthread_cond_t no_active_readers; + /** Number of active readers. */ + uint active_readers; + /** Number of writers waiting for readers to go away. */ + uint writers_waiting_readers; + /** Indicates whether there is an active writer. */ + my_bool active_writer; +#ifdef SAFE_MUTEX + /** Thread holding wr-lock (for debug purposes only). */ + pthread_t writer_thread; +#endif +} rw_pr_lock_t; + +extern int rw_pr_init(rw_pr_lock_t *); +extern int rw_pr_rdlock(rw_pr_lock_t *); +extern int rw_pr_wrlock(rw_pr_lock_t *); +extern int rw_pr_unlock(rw_pr_lock_t *); +extern int rw_pr_destroy(rw_pr_lock_t *); +#ifdef SAFE_MUTEX +#define rw_pr_lock_assert_write_owner(A) \ + DBUG_ASSERT((A)->active_writer && pthread_equal(pthread_self(), \ + (A)->writer_thread)) +#define rw_pr_lock_assert_not_write_owner(A) \ + DBUG_ASSERT(! (A)->active_writer || ! pthread_equal(pthread_self(), \ + (A)->writer_thread)) +#else +#define rw_pr_lock_assert_write_owner(A) +#define rw_pr_lock_assert_not_write_owner(A) +#endif /* SAFE_MUTEX */ + + +#ifdef NEED_MY_RW_LOCK + +#ifdef _WIN32 + +/** + Implementation of Windows rwlock. + + We use native (slim) rwlocks on Windows, which requires Win7 + or later. +*/ +typedef struct _my_rwlock_t +{ + SRWLOCK srwlock; /* native reader writer lock */ + BOOL have_exclusive_srwlock; /* used for unlock */ +} my_rw_lock_t; + + +#else /* _WIN32 */ + +/* + On systems which don't support native read/write locks we have + to use own implementation. +*/ +typedef struct st_my_rw_lock_t { + pthread_mutex_t lock; /* lock for structure */ + pthread_cond_t readers; /* waiting readers */ + pthread_cond_t writers; /* waiting writers */ + int state; /* -1:writer,0:free,>0:readers */ + int waiters; /* number of waiting writers */ +#ifdef SAFE_MUTEX + pthread_t write_thread; +#endif +} my_rw_lock_t; + +#endif /*! _WIN32 */ + +extern int my_rw_init(my_rw_lock_t *); +extern int my_rw_destroy(my_rw_lock_t *); +extern int my_rw_rdlock(my_rw_lock_t *); +extern int my_rw_wrlock(my_rw_lock_t *); +extern int my_rw_unlock(my_rw_lock_t *); +extern int my_rw_tryrdlock(my_rw_lock_t *); +extern int my_rw_trywrlock(my_rw_lock_t *); +#ifdef SAFE_MUTEX +#define my_rw_lock_assert_write_owner(A) \ + DBUG_ASSERT((A)->state == -1 && pthread_equal(pthread_self(), \ + (A)->write_thread)) +#define my_rw_lock_assert_not_write_owner(A) \ + DBUG_ASSERT((A)->state >= 0 || ! pthread_equal(pthread_self(), \ + (A)->write_thread)) +#else +#define my_rw_lock_assert_write_owner(A) +#define my_rw_lock_assert_not_write_owner(A) +#endif +#endif /* NEED_MY_RW_LOCK */ + + +#define GETHOSTBYADDR_BUFF_SIZE 2048 + +#ifndef HAVE_THR_SETCONCURRENCY +#define thr_setconcurrency(A) pthread_dummy(0) +#endif +#if !defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE) && ! defined(pthread_attr_setstacksize) +#define pthread_attr_setstacksize(A,B) pthread_dummy(0) +#endif + +/* Define mutex types, see my_thr_init.c */ +#define MY_MUTEX_INIT_SLOW NULL +#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP +extern pthread_mutexattr_t my_fast_mutexattr; +#define MY_MUTEX_INIT_FAST &my_fast_mutexattr +#else +#define MY_MUTEX_INIT_FAST NULL +#endif +#ifdef PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP +extern pthread_mutexattr_t my_errorcheck_mutexattr; +#define MY_MUTEX_INIT_ERRCHK &my_errorcheck_mutexattr +#else +#define MY_MUTEX_INIT_ERRCHK NULL +#endif + +#ifndef ESRCH +/* Define it to something */ +#define ESRCH 1 +#endif + +typedef uint64 my_thread_id; + +extern void my_threadattr_global_init(void); +extern my_bool my_thread_global_init(void); +extern void my_thread_global_reinit(void); +extern void my_thread_global_end(void); +extern my_bool my_thread_init(void); +extern void my_thread_end(void); +extern const char *my_thread_name(void); +extern my_thread_id my_thread_dbug_id(void); +extern int pthread_dummy(int); +extern void my_mutex_init(void); +extern void my_mutex_end(void); + +/* All thread specific variables are in the following struct */ + +#define THREAD_NAME_SIZE 10 +#ifndef DEFAULT_THREAD_STACK +/* + We need to have at least 256K stack to handle calls to myisamchk_init() + with the current number of keys and key parts. +*/ +#if defined(__SANITIZE_ADDRESS__) || defined(WITH_UBSAN) +#ifndef DBUG_OFF +#define DEFAULT_THREAD_STACK (1024*1024L) +#else +#define DEFAULT_THREAD_STACK (383*1024L) /* 392192 */ +#endif +#else +#define DEFAULT_THREAD_STACK (292*1024L) /* 299008 */ +#endif +#endif + +#define MY_PTHREAD_LOCK_READ 0 +#define MY_PTHREAD_LOCK_WRITE 1 + +#include <mysql/psi/mysql_thread.h> + +#define INSTRUMENT_ME 0 + +/* + Thread specific variables + + Aria key cache is using the following variables for keeping track of + state: + suspend, next, prev, keycache_link, keycache_file, suspend, lock_type + + MariaDB uses the following to + mutex, current_mutex, current_cond, abort +*/ + +struct st_my_thread_var +{ + int thr_errno; + mysql_cond_t suspend; + mysql_mutex_t mutex; + struct st_my_thread_var *next,**prev; + mysql_mutex_t * volatile current_mutex; + mysql_cond_t * volatile current_cond; + void *keycache_link; + void *keycache_file; + void *stack_ends_here; + safe_mutex_t *mutex_in_use; + pthread_t pthread_self; + my_thread_id id, dbug_id; + int volatile abort; + uint lock_type; /* used by conditional release the queue */ + my_bool init; +#ifndef DBUG_OFF + void *dbug; + char name[THREAD_NAME_SIZE+1]; +#endif +}; + +struct st_my_thread_var *_my_thread_var(void); +extern void **my_thread_var_dbug(void); +extern safe_mutex_t **my_thread_var_mutex_in_use(void); +extern uint my_thread_end_wait_time; +extern my_bool safe_mutex_deadlock_detector; +#define my_thread_var (_my_thread_var()) +#define my_errno my_thread_var->thr_errno +int set_mysys_var(struct st_my_thread_var *mysys_var); + + +/* + thread_safe_xxx functions are for critical statistic or counters. + The implementation is guaranteed to be thread safe, on all platforms. + Note that the calling code should *not* assume the counter is protected + by the mutex given, as the implementation of these helpers may change + to use my_atomic operations instead. +*/ + +#ifndef thread_safe_increment +#ifdef _WIN32 +#define thread_safe_increment(V,L) InterlockedIncrement((long*) &(V)) +#define thread_safe_decrement(V,L) InterlockedDecrement((long*) &(V)) +#else +#define thread_safe_increment(V,L) \ + (mysql_mutex_lock((L)), (V)++, mysql_mutex_unlock((L))) +#define thread_safe_decrement(V,L) \ + (mysql_mutex_lock((L)), (V)--, mysql_mutex_unlock((L))) +#endif +#endif + +#ifndef thread_safe_add +#ifdef _WIN32 +#define thread_safe_add(V,C,L) InterlockedExchangeAdd((long*) &(V),(C)) +#define thread_safe_sub(V,C,L) InterlockedExchangeAdd((long*) &(V),-(long) (C)) +#else +#define thread_safe_add(V,C,L) \ + (mysql_mutex_lock((L)), (V)+=(C), mysql_mutex_unlock((L))) +#define thread_safe_sub(V,C,L) \ + (mysql_mutex_lock((L)), (V)-=(C), mysql_mutex_unlock((L))) +#endif +#endif + + +/* + statistics_xxx functions are for non critical statistic, + maintained in global variables. + When compiling with SAFE_STATISTICS: + - race conditions can not occur. + - some locking occurs, which may cause performance degradation. + + When compiling without SAFE_STATISTICS: + - race conditions can occur, making the result slightly inaccurate. + - the lock given is not honored. +*/ +#ifdef SAFE_STATISTICS +#define statistic_increment(V,L) thread_safe_increment((V),(L)) +#define statistic_decrement(V,L) thread_safe_decrement((V),(L)) +#define statistic_add(V,C,L) thread_safe_add((V),(C),(L)) +#define statistic_sub(V,C,L) thread_safe_sub((V),(C),(L)) +#else +#define statistic_decrement(V,L) (V)-- +#define statistic_increment(V,L) (V)++ +#define statistic_add(V,C,L) (V)+=(C) +#define statistic_sub(V,C,L) (V)-=(C) +#endif /* SAFE_STATISTICS */ + +/* + No locking needed, the counter is owned by the thread +*/ +#define status_var_increment(V) (V)++ +#define status_var_decrement(V) (V)-- +#define status_var_add(V,C) (V)+=(C) +#define status_var_sub(V,C) (V)-=(C) + +#ifdef SAFE_MUTEX +#define mysql_mutex_record_order(A,B) \ + do { \ + mysql_mutex_lock(A); mysql_mutex_lock(B); \ + mysql_mutex_unlock(B); mysql_mutex_unlock(A); \ + } while(0) +#else +#define mysql_mutex_record_order(A,B) do { } while(0) +#endif + +/* At least Windows and NetBSD do not have this definition */ +#ifndef PTHREAD_STACK_MIN +#define PTHREAD_STACK_MIN 65536 +#endif + +#ifdef __cplusplus +} +#endif +#endif /* _my_ptread_h */ |