src/mutex.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) 1995-2010 Index Data
   3  * See the file LICENSE for details.
   4  */
   5
   6 /**
   7  * \file mutex.c
   8  * \brief Implements MUTEX functions
   9  *
  10  */
  11 #if HAVE_CONFIG_H
  12 #include <config.h>
  13 #endif
  14
  15 #include <assert.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <errno.h>
  19 #include <stddef.h>
  20 #include <yaz/xmalloc.h>
  21 #include <yaz/nmem.h>
  22 #include <yaz/log.h>
  23 #include <yaz/mutex.h>
  24
  25 #ifdef WIN32
  26 #include <windows.h>
  27 #endif
  28
  29 #if YAZ_POSIX_THREADS
  30 #include <pthread.h>
  31 #endif
  32
  33 #if YAZ_GNU_THREADS
  34 #include <pth.h>
  35 #endif
  36
  37 #ifdef WIN32
  38 struct yaz_mutex {
  39     CRITICAL_SECTION m_handle;
  40 };
  41 #elif YAZ_POSIX_THREADS
  42 struct yaz_mutex {
  43     pthread_mutex_t m_handle;
  44 };
  45 #elif YAZ_GNU_THREADS
  46 struct yaz_mutex {
  47     pth_mutex_t m_handle;
  48 };
  49 #else
  50 struct yaz_mutex {
  51     int dummy;
  52 };
  53 #endif
  54
  55 YAZ_EXPORT void yaz_mutex_create(YAZ_MUTEX *p)
  56 {
  57     if (!*p)
  58     {
  59         *p = (YAZ_MUTEX) malloc(sizeof(**p));
  60 #ifdef WIN32
  61         InitializeCriticalSection(&(*p)->m_handle);
  62 #elif YAZ_POSIX_THREADS
  63         pthread_mutex_init(&(*p)->m_handle, 0);
  64 #elif YAZ_GNU_THREADS
  65         pth_mutex_init(&(*p)->m_handle);
  66 #endif
  67     }
  68 }
  69
  70 YAZ_EXPORT void yaz_mutex_enter(YAZ_MUTEX p)
  71 {
  72     if (p)
  73     {
  74 #ifdef WIN32
  75         EnterCriticalSection(&p->m_handle);
  76 #elif YAZ_POSIX_THREADS
  77         pthread_mutex_lock(&p->m_handle);
  78 #endif
  79     }
  80 }
  81
  82 YAZ_EXPORT void yaz_mutex_leave(YAZ_MUTEX p)
  83 {
  84     if (p)
  85     {
  86 #ifdef WIN32
  87         LeaveCriticalSection(&p->m_handle);
  88 #elif YAZ_POSIX_THREADS
  89         pthread_mutex_unlock(&p->m_handle);
  90 #endif
  91     }
  92 }
  93
  94 YAZ_EXPORT void yaz_mutex_destroy(YAZ_MUTEX *p)
  95 {
  96     if (*p)
  97     {
  98 #ifdef WIN32
  99         DeleteCriticalSection(&(*p)->m_handle);
 100 #endif
 101         free(*p);
 102         *p = 0;
 103     }
 104 }
 105
 106 /*
 107  * Local variables:
 108  * c-basic-offset: 4
 109  * c-file-style: "Stroustrup"
 110  * indent-tabs-mode: nil
 111  * End:
 112  * vim: shiftwidth=4 tabstop=8 expandtab
 113  */
 114