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Diffstat (limited to 'externals/mysql/my_pthread.h')
| -rw-r--r-- | externals/mysql/my_pthread.h | 734 |
1 files changed, 734 insertions, 0 deletions
diff --git a/externals/mysql/my_pthread.h b/externals/mysql/my_pthread.h new file mode 100644 index 00000000000..ab26860db43 --- /dev/null +++ b/externals/mysql/my_pthread.h @@ -0,0 +1,734 @@ +/* Copyright (C) 2000-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc. + + 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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; + +typedef struct { + uint32 waiting; + CRITICAL_SECTION lock_waiting; + + enum { + SIGNAL= 0, + BROADCAST= 1, + MAX_EVENTS= 2 + } EVENTS; + + HANDLE events[MAX_EVENTS]; + HANDLE broadcast_block_event; + +} 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 *); + +/* + Struct and macros to be used in combination with the + windows implementation of pthread_cond_timedwait +*/ + +/* + Declare a union to make sure FILETIME is properly aligned + so it can be used directly as a 64 bit value. The value + stored is in 100ns units. + */ +union ft64 { + FILETIME ft; + __int64 i64; +}; + +struct timespec { + union ft64 tv; + /* The max timeout value in millisecond for pthread_cond_timedwait */ + long max_timeout_msec; +}; + +#define set_timespec_time_nsec(ABSTIME,TIME,NSEC) do { \ + (ABSTIME).tv.i64= (TIME)+(__int64)(NSEC)/100; \ + (ABSTIME).max_timeout_msec= (long)((NSEC)/1000000); \ +} while(0) + +#define set_timespec_nsec(ABSTIME,NSEC) do { \ + union ft64 tv; \ + GetSystemTimeAsFileTime(&tv.ft); \ + set_timespec_time_nsec((ABSTIME), tv.i64, (NSEC)); \ +} while(0) + +int win_pthread_mutex_trylock(pthread_mutex_t *mutex); +int pthread_create(pthread_t *,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, + 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,DWORD stack); +int pthread_attr_destroy(pthread_attr_t *connect_att); +struct tm *localtime_r(const time_t *timep,struct tm *tmp); +struct tm *gmtime_r(const time_t *timep,struct tm *tmp); + +void pthread_exit(void *a); +int pthread_join(pthread_t thread, void **value_ptr); + + +#define ETIMEDOUT 145 /* Win32 doesn't have this */ +#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),(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) +#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() + + +#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 + +#ifdef __NETWARE__ +void my_pthread_exit(void *status); +#define pthread_exit(A) my_pthread_exit(A) +#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 *); + +/* 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 + +#ifndef HAVE_NONPOSIX_SIGWAIT +#define my_sigwait(A,B) sigwait((A),(B)) +#else +int my_sigwait(const sigset_t *set,int *sig); +#endif + +#ifdef HAVE_NONPOSIX_PTHREAD_MUTEX_INIT +#ifndef SAFE_MUTEX +#define pthread_mutex_init(a,b) my_pthread_mutex_noposix_init((a),(b)) +extern int my_pthread_mutex_noposix_init(pthread_mutex_t *mp, + const pthread_mutexattr_t *attr); +#endif /* SAFE_MUTEX */ +#define pthread_cond_init(a,b) my_pthread_cond_noposix_init((a),(b)) +extern int my_pthread_cond_noposix_init(pthread_cond_t *mp, + const pthread_condattr_t *attr); +#endif /* HAVE_NONPOSIX_PTHREAD_MUTEX_INIT */ + +#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(HAVE_NONPOSIX_SIGWAIT) && !defined(HAVE_DEC_3_2_THREADS) && !defined(_AIX) +int sigwait(sigset_t *setp, int *sigp); /* Use our implemention */ +#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; int l_rc; \ + DBUG_ASSERT((A) != 0); \ + sigemptyset(&l_set); \ + l_s.sa_handler = (B); \ + l_s.sa_mask = l_set; \ + l_s.sa_flags = 0; \ + l_rc= sigaction((A), &l_s, (struct sigaction *) NULL);\ + DBUG_ASSERT(l_rc == 0); \ + } 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) || defined(HAVE_DEC_3_2_THREADS) +#define pthread_attr_setscope(A,B) +#undef HAVE_GETHOSTBYADDR_R /* No definition */ +#endif + +#if defined(HAVE_BROKEN_PTHREAD_COND_TIMEDWAIT) && !defined(SAFE_MUTEX) +extern int my_pthread_cond_timedwait(pthread_cond_t *cond, + pthread_mutex_t *mutex, + struct timespec *abstime); +#define pthread_cond_timedwait(A,B,C) my_pthread_cond_timedwait((A),(B),(C)) +#endif + +#if !defined( HAVE_NONPOSIX_PTHREAD_GETSPECIFIC) +#define my_pthread_getspecific(A,B) ((A) pthread_getspecific(B)) +#else +#define my_pthread_getspecific(A,B) ((A) my_pthread_getspecific_imp(B)) +void *my_pthread_getspecific_imp(pthread_key_t key); +#endif + +#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)) || defined(HAVE_DEC_3_2_THREADS)) +/* 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); } +#elif !defined(__NETWARE__) /* HAVE_PTHREAD_ATTR_CREATE && !HAVE_SIGWAIT */ +#ifndef HAVE_PTHREAD_KILL +# define HAVE_PTHREAD_KILL +#endif +#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_ONE_ARG) && !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 + +/* + 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_getsystime(),(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 */ + +#ifndef set_timespec_time_nsec +#define set_timespec_time_nsec(ABSTIME,TIME,NSEC) do { \ + ulonglong nsec= (NSEC); \ + ulonglong now= (TIME) + (nsec/100); \ + (ABSTIME).MY_tv_sec= (now / 10000000ULL); \ + (ABSTIME).MY_tv_nsec= (now % 10000000ULL * 100 + (nsec % 100)); \ +} while(0) +#endif /* !set_timespec_time_nsec */ + +/* safe_mutex adds checking to mutex for easier debugging */ + +#if defined(__NETWARE__) && !defined(SAFE_MUTEX_DETECT_DESTROY) +#define SAFE_MUTEX_DETECT_DESTROY +#endif +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 seperate + 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, myf my_flags, + 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, + 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 +#undef pthread_mutex_init +#undef pthread_mutex_lock +#undef pthread_mutex_unlock +#undef pthread_mutex_destroy +#undef pthread_mutex_wait +#undef pthread_mutex_timedwait +#undef pthread_mutex_t +#undef pthread_cond_wait +#undef pthread_cond_timedwait +#undef pthread_mutex_trylock +#define my_pthread_mutex_init(A,B,C,D) safe_mutex_init((A),(B),(C),(D),__FILE__,__LINE__) +#define pthread_mutex_init(A,B) safe_mutex_init((A),(B),#A,0,__FILE__,__LINE__) +#define pthread_mutex_lock(A) safe_mutex_lock((A), 0, __FILE__, __LINE__) +#define my_pthread_mutex_lock(A,B) safe_mutex_lock((A), (B), __FILE__, __LINE__) +#define pthread_mutex_unlock(A) safe_mutex_unlock((A),__FILE__,__LINE__) +#define pthread_mutex_destroy(A) safe_mutex_destroy((A),__FILE__,__LINE__) +#define pthread_cond_wait(A,B) safe_cond_wait((A),(B),__FILE__,__LINE__) +#define pthread_cond_timedwait(A,B,C) safe_cond_timedwait((A),(B),(C),__FILE__,__LINE__) +#define pthread_mutex_trylock(A) safe_mutex_lock((A), MYF_TRY_LOCK, __FILE__, __LINE__) +#define pthread_mutex_t safe_mutex_t +#define safe_mutex_assert_owner(mp) \ + DBUG_ASSERT((mp)->count > 0 && \ + pthread_equal(pthread_self(), (mp)->thread)) +#define safe_mutex_assert_not_owner(mp) \ + DBUG_ASSERT(! (mp)->count || \ + ! pthread_equal(pthread_self(), (mp)->thread)) +#else +#define my_pthread_mutex_init(A,B,C,D) pthread_mutex_init((A),(B)) +#define my_pthread_mutex_lock(A,B) pthread_mutex_lock(A) +#define safe_mutex_assert_owner(mp) +#define safe_mutex_assert_not_owner(mp) +#endif /* SAFE_MUTEX */ + +#if defined(MY_PTHREAD_FASTMUTEX) && !defined(SAFE_MUTEX) +typedef struct st_my_pthread_fastmutex_t +{ + pthread_mutex_t mutex; + uint spins; + uint rng_state; +} my_pthread_fastmutex_t; +void fastmutex_global_init(void); + +int my_pthread_fastmutex_init(my_pthread_fastmutex_t *mp, + const pthread_mutexattr_t *attr); +int my_pthread_fastmutex_lock(my_pthread_fastmutex_t *mp); + +#undef pthread_mutex_init +#undef pthread_mutex_lock +#undef pthread_mutex_unlock +#undef pthread_mutex_destroy +#undef pthread_mutex_wait +#undef pthread_mutex_timedwait +#undef pthread_mutex_t +#undef pthread_cond_wait +#undef pthread_cond_timedwait +#undef pthread_mutex_trylock +#define pthread_mutex_init(A,B) my_pthread_fastmutex_init((A),(B)) +#define pthread_mutex_lock(A) my_pthread_fastmutex_lock(A) +#define pthread_mutex_unlock(A) pthread_mutex_unlock(&(A)->mutex) +#define pthread_mutex_destroy(A) pthread_mutex_destroy(&(A)->mutex) +#define pthread_cond_wait(A,B) pthread_cond_wait((A),&(B)->mutex) +#define pthread_cond_timedwait(A,B,C) pthread_cond_timedwait((A),&(B)->mutex,(C)) +#define pthread_mutex_trylock(A) pthread_mutex_trylock(&(A)->mutex) +#define pthread_mutex_t my_pthread_fastmutex_t +#endif /* defined(MY_PTHREAD_FASTMUTEX) && !defined(SAFE_MUTEX) */ + + /* READ-WRITE thread locking */ + +#ifdef HAVE_BROKEN_RWLOCK /* For OpenUnix */ +#undef HAVE_PTHREAD_RWLOCK_RDLOCK +#undef HAVE_RWLOCK_INIT +#undef HAVE_RWLOCK_T +#endif + +#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 */ +typedef struct _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 */ +} my_rw_lock_t; + +#define rw_lock_t my_rw_lock_t +#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_rwlock_destroy((A)) + +extern int my_rwlock_init(my_rw_lock_t *, void *); +extern int my_rwlock_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 *); +#endif /* USE_MUTEX_INSTEAD_OF_RW_LOCKS */ + +#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 ulong my_thread_id; + +extern void my_threadattr_global_init(void); +extern my_bool my_thread_global_init(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); + +/* All thread specific variables are in the following struct */ + +#define THREAD_NAME_SIZE 10 +#ifndef DEFAULT_THREAD_STACK +#if SIZEOF_CHARP > 4 +/* + MySQL can survive with 32K, but some glibc libraries require > 128K stack + To resolve hostnames. Also recursive stored procedures needs stack. +*/ +#define DEFAULT_THREAD_STACK (256*1024L) +#else +#define DEFAULT_THREAD_STACK (195*1024) +#endif +#endif + +#define MY_PTHREAD_LOCK_READ 0 +#define MY_PTHREAD_LOCK_WRITE 1 + +struct st_my_thread_var +{ + int thr_errno; + pthread_cond_t suspend; + pthread_mutex_t mutex; + pthread_mutex_t * volatile current_mutex; + pthread_cond_t * volatile current_cond; + pthread_t pthread_self; + my_thread_id id; + int cmp_length; + int volatile abort; + my_bool init; + struct st_my_thread_var *next,**prev; + void *opt_info; + uint lock_type; /* used by conditional release the queue */ + void *stack_ends_here; + safe_mutex_t *mutex_in_use; +#ifndef DBUG_OFF + void *dbug; + char name[THREAD_NAME_SIZE+1]; +#endif +}; + +extern struct st_my_thread_var *_my_thread_var(void) __attribute__ ((const)); +extern void **my_thread_var_dbug(); +extern safe_mutex_t **my_thread_var_mutex_in_use(); +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 +/* + Keep track of shutdown,signal, and main threads so that my_end() will not + report errors with them +*/ + +/* Which kind of thread library is in use */ + +#define THD_LIB_OTHER 1 +#define THD_LIB_NPTL 2 +#define THD_LIB_LT 4 + +extern uint thd_lib_detected; + +/* + 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. +*/ + +/* + Warning: + When compiling without threads, this file is not included. + See the *other* declarations of thread_safe_xxx in include/my_global.h + + Second warning: + See include/config-win.h, for yet another implementation. +*/ +#ifdef THREAD +#ifndef thread_safe_increment +#define thread_safe_increment(V,L) \ + (pthread_mutex_lock((L)), (V)++, pthread_mutex_unlock((L))) +#define thread_safe_decrement(V,L) \ + (pthread_mutex_lock((L)), (V)--, pthread_mutex_unlock((L))) +#endif + +#ifndef thread_safe_add +#define thread_safe_add(V,C,L) \ + (pthread_mutex_lock((L)), (V)+=(C), pthread_mutex_unlock((L))) +#define thread_safe_sub(V,C,L) \ + (pthread_mutex_lock((L)), (V)-=(C), pthread_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 __cplusplus +} +#endif +#endif /* _my_ptread_h */ |