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/**************************************************************************
*
* 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 <errno.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#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_ */
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