1 /* This file is part of the YAZ toolkit.
2 * Copyright (C) 1995-2010 Index Data.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
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9 * * Redistributions in binary form must reproduce the above copyright
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30 * \brief Header for Mutex functions
36 #include <yaz/yconfig.h>
40 /** \brief YAZ MUTEX opaque pointer */
41 typedef struct yaz_mutex *YAZ_MUTEX;
43 /** \brief create MUTEX
44 \param mutexp is pointer to MUTEX handle (*mutexp must be NULL)
46 It is important that *mutexp is NULL. If not, yaz_mutex_create will
47 not modify the handle (assumes it is already created!)
49 YAZ_EXPORT void yaz_mutex_create(YAZ_MUTEX *mutexp);
51 /** \brief enter critical section / AKA lock
52 \param mutex MUTEX handle
54 YAZ_EXPORT void yaz_mutex_enter(YAZ_MUTEX mutex);
57 /** \brief leave critical section / AKA unlock
58 \param mutex MUTEX handle
60 YAZ_EXPORT void yaz_mutex_leave(YAZ_MUTEX mutex);
63 /** \brief destroy MUTEX
64 \param mutexp pointer to MUTEX handle
66 If *mutexp is NULL, then this function does nothing.
68 YAZ_EXPORT void yaz_mutex_destroy(YAZ_MUTEX *mutexp);
71 /** \brief sets name of MUTEX for debugging purposes
72 \param mutex MUTEX handle
73 \param log_level YAZ log level
74 \param name user-given name associated with MUTEX
76 If log_level != 0 and name != 0 this function will make yaz_mutex_enter
77 and yaz_mutex_leave print information for each invocation using yaz_log
78 with the level given. In particular when YAZ is compiled with pthreads,
79 yaz_mutex_enter will inform if a lock is not immediately acquired.
80 This function should be called after a MUTEX is created but before
81 it is used for locking.
83 void yaz_mutex_set_name(YAZ_MUTEX mutex, int log_level, const char *name);
91 * c-file-style: "Stroustrup"
92 * indent-tabs-mode: nil
94 * vim: shiftwidth=4 tabstop=8 expandtab