/* * The MIT License * * Copyright (C) 2017 Alexander Saprykin * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * 'Software'), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "pmem.h" #include "pmutex.h" #include #define INCL_DOSSEMAPHORES #define INCL_DOSERRORS #include typedef HMTX mutex_hdl; struct PMutex_ { mutex_hdl hdl; }; P_LIB_API PMutex * p_mutex_new (void) { PMutex *ret; if (P_UNLIKELY ((ret = p_malloc0 (sizeof (PMutex))) == NULL)) { P_ERROR ("PMutex::p_mutex_new: failed to allocate memory"); return NULL; } if (P_UNLIKELY (DosCreateMutexSem (NULL, (PHMTX) &ret->hdl, 0, FALSE) != NO_ERROR)) { P_ERROR ("PMutex::p_mutex_new: DosCreateMutexSem() failed"); p_free (ret); return NULL; } return ret; } P_LIB_API pboolean p_mutex_lock (PMutex *mutex) { APIRET ulrc; if (P_UNLIKELY (mutex == NULL)) return FALSE; while ((ulrc = DosRequestMutexSem (mutex->hdl, SEM_INDEFINITE_WAIT)) == ERROR_INTERRUPT) ; if (P_LIKELY (ulrc == NO_ERROR)) return TRUE; else { P_ERROR ("PMutex::p_mutex_lock: DosRequestMutexSem() failed"); return FALSE; } } P_LIB_API pboolean p_mutex_trylock (PMutex *mutex) { if (P_UNLIKELY (mutex == NULL)) return FALSE; return (DosRequestMutexSem (mutex->hdl, SEM_IMMEDIATE_RETURN)) == NO_ERROR ? TRUE : FALSE; } P_LIB_API pboolean p_mutex_unlock (PMutex *mutex) { if (P_UNLIKELY (mutex == NULL)) return FALSE; if (P_LIKELY (DosReleaseMutexSem (mutex->hdl) == NO_ERROR)) return TRUE; else { P_ERROR ("PMutex::p_mutex_unlock: DosReleaseMutexSem() failed"); return FALSE; } } P_LIB_API void p_mutex_free (PMutex *mutex) { if (P_UNLIKELY (mutex == NULL)) return; if (P_UNLIKELY (DosCloseMutexSem (mutex->hdl) != NO_ERROR)) P_ERROR ("PMutex::p_mutex_free: DosCloseMutexSem() failed"); p_free (mutex); }