| /* |
| * Mesa 3-D graphics library |
| * |
| * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. |
| * |
| * 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. |
| */ |
| |
| |
| /* |
| * Thread support for gl dispatch. |
| * |
| * Initial version by John Stone (j.stone@acm.org) (johns@cs.umr.edu) |
| * and Christoph Poliwoda (poliwoda@volumegraphics.com) |
| * Revised by Keith Whitwell |
| * Adapted for new gl dispatcher by Brian Paul |
| * Modified for use in mapi by Chia-I Wu |
| */ |
| |
| /* |
| * If this file is accidentally included by a non-threaded build, |
| * it should not cause the build to fail, or otherwise cause problems. |
| * In general, it should only be included when needed however. |
| */ |
| |
| #ifndef _U_THREAD_H_ |
| #define _U_THREAD_H_ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include "u_compiler.h" |
| |
| #include "c11/threads.h" |
| |
| #if defined(HAVE_PTHREAD) || defined(_WIN32) |
| #ifndef THREADS |
| #define THREADS |
| #endif |
| #endif |
| |
| /* |
| * Error messages |
| */ |
| #define INIT_TSD_ERROR "Mesa: failed to allocate key for thread specific data" |
| #define GET_TSD_ERROR "Mesa: failed to get thread specific data" |
| #define SET_TSD_ERROR "Mesa: thread failed to set thread specific data" |
| |
| |
| /* |
| * Magic number to determine if a TSD object has been initialized. |
| * Kind of a hack but there doesn't appear to be a better cross-platform |
| * solution. |
| */ |
| #define INIT_MAGIC 0xff8adc98 |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| |
| struct u_tsd { |
| tss_t key; |
| unsigned initMagic; |
| }; |
| |
| |
| static INLINE unsigned long |
| u_thread_self(void) |
| { |
| /* |
| * XXX: Callers of u_thread_self assume it is a lightweight function, |
| * returning a numeric value. But unfortunately C11's thrd_current() gives |
| * no such guarantees. In fact, it's pretty hard to have a compliant |
| * implementation of thrd_current() on Windows with such characteristics. |
| * So for now, we side-step this mess and use Windows thread primitives |
| * directly here. |
| * |
| * FIXME: On the other hand, u_thread_self() is a bad |
| * abstraction. Even with pthreads, there is no guarantee that |
| * pthread_self() will return numeric IDs -- we should be using |
| * pthread_equal() instead of assuming we can compare thread ids... |
| */ |
| #ifdef _WIN32 |
| return GetCurrentThreadId(); |
| #else |
| return (unsigned long) (uintptr_t) thrd_current(); |
| #endif |
| } |
| |
| |
| static INLINE void |
| u_tsd_init(struct u_tsd *tsd) |
| { |
| if (tss_create(&tsd->key, NULL/*free*/) != 0) { |
| perror(INIT_TSD_ERROR); |
| exit(-1); |
| } |
| tsd->initMagic = INIT_MAGIC; |
| } |
| |
| |
| static INLINE void * |
| u_tsd_get(struct u_tsd *tsd) |
| { |
| if (tsd->initMagic != INIT_MAGIC) { |
| u_tsd_init(tsd); |
| } |
| return tss_get(tsd->key); |
| } |
| |
| |
| static INLINE void |
| u_tsd_set(struct u_tsd *tsd, void *ptr) |
| { |
| if (tsd->initMagic != INIT_MAGIC) { |
| u_tsd_init(tsd); |
| } |
| if (tss_set(tsd->key, ptr) != 0) { |
| perror(SET_TSD_ERROR); |
| exit(-1); |
| } |
| } |
| |
| |
| static INLINE void |
| u_tsd_destroy(struct u_tsd *tsd) |
| { |
| if (tsd->initMagic != INIT_MAGIC) { |
| return; |
| } |
| tss_delete(tsd->key); |
| tsd->initMagic = 0x0; |
| } |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _U_THREAD_H_ */ |