/************************************************************************** * * Copyright 1999-2006 Brian Paul * Copyright 2008 VMware, Inc. * 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. * **************************************************************************/ #ifndef U_THREAD_H_ #define U_THREAD_H_ #include #include #include #include #include "c11/threads.h" #include "detect_os.h" /* Some highly performance-sensitive thread-local variables like the current GL * context are declared with the initial-exec model on Linux. glibc allocates a * fixed number of extra slots for initial-exec TLS variables at startup, and * Mesa relies on (even if it's dlopen()ed after init) being able to fit into * those. This model saves the call to look up the address of the TLS variable. * * However, if we don't have this TLS model available on the platform, then we * still want to use normal TLS (which involves a function call, but not the * expensive pthread_getspecific() or its equivalent). */ #ifdef USE_ELF_TLS #if DETECT_OS_APPLE /* Apple Clang emits wrappers when using thread_local that break module linkage, * but not with __thread */ #define __THREAD_INITIAL_EXEC __thread #elif defined(__GLIBC__) #define __THREAD_INITIAL_EXEC thread_local __attribute__((tls_model("initial-exec"))) #define REALLY_INITIAL_EXEC #else #define __THREAD_INITIAL_EXEC thread_local #endif #endif #ifdef __cplusplus extern "C" { #endif int util_get_current_cpu(void); int u_thread_create(thrd_t *thrd, int (*routine)(void *), void *param); void u_thread_setname( const char *name ); /** * Set thread affinity. * * \param thread Thread * \param mask Set this affinity mask * \param old_mask Previous affinity mask returned if not NULL * \param num_mask_bits Number of bits in both masks * \return true on success */ bool util_set_thread_affinity(thrd_t thread, const uint32_t *mask, uint32_t *old_mask, unsigned num_mask_bits); static inline bool util_set_current_thread_affinity(const uint32_t *mask, uint32_t *old_mask, unsigned num_mask_bits) { return util_set_thread_affinity(thrd_current(), mask, old_mask, num_mask_bits); } /* * Thread statistics. */ /* Return the time of a thread's CPU time clock. */ int64_t util_thread_get_time_nano(thrd_t thread); /* Return the time of the current thread's CPU time clock. */ static inline int64_t util_current_thread_get_time_nano(void) { return util_thread_get_time_nano(thrd_current()); } static inline bool u_thread_is_self(thrd_t thread) { return thrd_equal(thrd_current(), thread); } /* * util_barrier */ #if defined(HAVE_PTHREAD) && !defined(__APPLE__) && !defined(__HAIKU__) typedef pthread_barrier_t util_barrier; #else /* If the OS doesn't have its own, implement barriers using a mutex and a condvar */ typedef struct { unsigned count; unsigned waiters; uint64_t sequence; mtx_t mutex; cnd_t condvar; } util_barrier; #endif void util_barrier_init(util_barrier *barrier, unsigned count); void util_barrier_destroy(util_barrier *barrier); bool util_barrier_wait(util_barrier *barrier); #ifdef __cplusplus } #endif #endif /* U_THREAD_H_ */