From 35a201cc8ef0c3f5b2df88d2e528aabee1048348 Mon Sep 17 00:00:00 2001 From: Wojtek Kosior Date: Fri, 30 Apr 2021 18:47:09 +0200 Subject: Initial/Final commit --- mariadb-connector-c-v_2.3.7/libmariadb/thr_mutex.c | 231 +++++++++++++++++++++ 1 file changed, 231 insertions(+) create mode 100644 mariadb-connector-c-v_2.3.7/libmariadb/thr_mutex.c (limited to 'mariadb-connector-c-v_2.3.7/libmariadb/thr_mutex.c') diff --git a/mariadb-connector-c-v_2.3.7/libmariadb/thr_mutex.c b/mariadb-connector-c-v_2.3.7/libmariadb/thr_mutex.c new file mode 100644 index 0000000..102bb33 --- /dev/null +++ b/mariadb-connector-c-v_2.3.7/libmariadb/thr_mutex.c @@ -0,0 +1,231 @@ +/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + + This library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this library; if not, write to the Free + Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + MA 02111-1301, USA */ + +/* This makes a wrapper for mutex handling to make it easier to debug mutex */ + +#include +#if defined(HAVE_LINUXTHREADS) && !defined (__USE_UNIX98) +#define __USE_UNIX98 /* To get rw locks under Linux */ +#endif +#include +#if defined(THREAD) && defined(SAFE_MUTEX) +#undef SAFE_MUTEX /* Avoid safe_mutex redefinitions */ +#include + +#ifndef DO_NOT_REMOVE_THREAD_WRAPPERS +/* Remove wrappers */ +#undef pthread_mutex_init +#undef pthread_mutex_lock +#undef pthread_mutex_unlock +#undef pthread_mutex_destroy +#undef pthread_cond_wait +#undef pthread_cond_timedwait +#ifdef HAVE_NONPOSIX_PTHREAD_MUTEX_INIT +#define pthread_mutex_init(a,b) my_pthread_mutex_init((a),(b)) +#endif +#endif /* DO_NOT_REMOVE_THREAD_WRAPPERS */ + +int safe_mutex_init(safe_mutex_t *mp, + const pthread_mutexattr_t *attr __attribute__((unused))) +{ + bzero((char*) mp,sizeof(*mp)); + pthread_mutex_init(&mp->global,MY_MUTEX_INIT_ERRCHK); + pthread_mutex_init(&mp->mutex,attr); + return 0; +} + +int safe_mutex_lock(safe_mutex_t *mp,const char *file, uint line) +{ + int error; + pthread_mutex_lock(&mp->global); + if (mp->count > 0 && pthread_equal(pthread_self(),mp->thread)) + { + fprintf(stderr,"safe_mutex: Trying to lock mutex at %s, line %d, when the mutex was already locked at %s, line %d\n", + file,line,mp->file,mp->line); + fflush(stderr); + abort(); + } + pthread_mutex_unlock(&mp->global); + error=pthread_mutex_lock(&mp->mutex); + if (error || (error=pthread_mutex_lock(&mp->global))) + { + fprintf(stderr,"Got error %d when trying to lock mutex at %s, line %d\n", + error, file, line); + fflush(stderr); + abort(); + } + if (mp->count++) + { + fprintf(stderr,"safe_mutex: Error in thread libray: Got mutex at %s, line %d more than 1 time\n", file,line); + fflush(stderr); + abort(); + } + mp->thread=pthread_self(); + mp->file= (char*) file; + mp->line=line; + pthread_mutex_unlock(&mp->global); + return error; +} + + +int safe_mutex_unlock(safe_mutex_t *mp,const char *file, uint line) +{ + int error; + pthread_mutex_lock(&mp->global); + if (mp->count == 0) + { + fprintf(stderr,"safe_mutex: Trying to unlock mutex that wasn't locked at %s, line %d\n Last used at %s, line: %d\n", + file,line,mp->file ? mp->file : "",mp->line); + fflush(stderr); + abort(); + } + if (!pthread_equal(pthread_self(),mp->thread)) + { + fprintf(stderr,"safe_mutex: Trying to unlock mutex at %s, line %d that was locked by another thread at: %s, line: %d\n", + file,line,mp->file,mp->line); + fflush(stderr); + abort(); + } + mp->count--; +#ifdef _WIN32 + pthread_mutex_unlock(&mp->mutex); + error=0; +#else + error=pthread_mutex_unlock(&mp->mutex); + if (error) + { + fprintf(stderr,"safe_mutex: Got error: %d when trying to unlock mutex at %s, line %d\n", error, file, line); + fflush(stderr); + abort(); + } +#endif /* _WIN32 */ + pthread_mutex_unlock(&mp->global); + return error; +} + + +int safe_cond_wait(pthread_cond_t *cond, safe_mutex_t *mp, const char *file, + uint line) +{ + int error; + pthread_mutex_lock(&mp->global); + if (mp->count == 0) + { + fprintf(stderr,"safe_mutex: Trying to cond_wait on a unlocked mutex at %s, line %d\n",file,line); + fflush(stderr); + abort(); + } + if (!pthread_equal(pthread_self(),mp->thread)) + { + fprintf(stderr,"safe_mutex: Trying to cond_wait on a mutex at %s, line %d that was locked by another thread at: %s, line: %d\n", + file,line,mp->file,mp->line); + fflush(stderr); + abort(); + } + + if (mp->count-- != 1) + { + fprintf(stderr,"safe_mutex: Count was %d on locked mutex at %s, line %d\n", + mp->count+1, file, line); + fflush(stderr); + abort(); + } + pthread_mutex_unlock(&mp->global); + error=pthread_cond_wait(cond,&mp->mutex); + pthread_mutex_lock(&mp->global); + if (error) + { + fprintf(stderr,"safe_mutex: Got error: %d when doing a safe_mutex_wait at %s, line %d\n", error, file, line); + fflush(stderr); + abort(); + } + if (mp->count++) + { + fprintf(stderr, + "safe_mutex: Count was %d in thread %lx when locking mutex at %s, line %d\n", + mp->count-1, my_thread_id(), file, line); + fflush(stderr); + abort(); + } + mp->thread=pthread_self(); + mp->file= (char*) file; + mp->line=line; + pthread_mutex_unlock(&mp->global); + return error; +} + + +int safe_cond_timedwait(pthread_cond_t *cond, safe_mutex_t *mp, + struct timespec *abstime, + const char *file, uint line) +{ + int error; + pthread_mutex_lock(&mp->global); + if (mp->count != 1 || !pthread_equal(pthread_self(),mp->thread)) + { + fprintf(stderr,"safe_mutex: Trying to cond_wait at %s, line %d on a not hold mutex\n",file,line); + fflush(stderr); + abort(); + } + mp->count--; /* Mutex will be released */ + pthread_mutex_unlock(&mp->global); + error=pthread_cond_timedwait(cond,&mp->mutex,abstime); +#ifdef EXTRA_DEBUG + if (error && (error != EINTR && error != ETIMEDOUT)) + { + fprintf(stderr,"safe_mutex: Got error: %d when doing a safe_mutex_timedwait at %s, line %d\n", error, file, line); + } +#endif + pthread_mutex_lock(&mp->global); + if (mp->count++) + { + fprintf(stderr, + "safe_mutex: Count was %d in thread %lx when locking mutex at %s, line %d (error: %d)\n", + mp->count-1, my_thread_id(), file, line, error); + fflush(stderr); + abort(); + } + mp->thread=pthread_self(); + mp->file= (char*) file; + mp->line=line; + pthread_mutex_unlock(&mp->global); + return error; +} + +int safe_mutex_destroy(safe_mutex_t *mp, const char *file, uint line) +{ + int error=0; + if (mp->count != 0) + { + fprintf(stderr,"safe_mutex: Trying to destroy a mutex that was locked at %s, line %d at %s, line %d\n", + mp->file,mp->line, file, line); + fflush(stderr); + abort(); + } +#ifdef _WIN32 + pthread_mutex_destroy(&mp->global); + pthread_mutex_destroy(&mp->mutex); +#else + if (pthread_mutex_destroy(&mp->global)) + error=1; + if (pthread_mutex_destroy(&mp->mutex)) + error=1; +#endif + return error; +} + +#endif /* THREAD && SAFE_MUTEX */ -- cgit v1.2.3