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/*
* Copyright 1999-2006 Brian Paul
* Copyright 2008 VMware, Inc.
* Copyright 2022 Yonggang Luo
* SPDX-License-Identifier: MIT
*/
#include "util/u_thread.h"
#include "macros.h"
#ifdef HAVE_PTHREAD
#include <signal.h>
#ifdef HAVE_PTHREAD_NP_H
#include <pthread_np.h>
#endif
#endif
#ifdef __HAIKU__
#include <OS.h>
#endif
#if DETECT_OS_LINUX && !defined(ANDROID)
#include <sched.h>
#elif defined(_WIN32) && !defined(HAVE_PTHREAD)
#include <windows.h>
#endif
#ifdef __FreeBSD__
/* pthread_np.h -> sys/param.h -> machine/param.h
* - defines ALIGN which clashes with our ALIGN
*/
#undef ALIGN
#define cpu_set_t cpuset_t
#endif
int
util_get_current_cpu(void)
{
#if DETECT_OS_LINUX && !defined(ANDROID)
return sched_getcpu();
#elif defined(_WIN32) && !defined(HAVE_PTHREAD)
return GetCurrentProcessorNumber();
#else
return -1;
#endif
}
int u_thread_create(thrd_t *thrd, int (*routine)(void *), void *param)
{
int ret = thrd_error;
#ifdef HAVE_PTHREAD
sigset_t saved_set, new_set;
sigfillset(&new_set);
sigdelset(&new_set, SIGSYS);
/* SIGSEGV is commonly used by Vulkan API tracing layers in order to track
* accesses in device memory mapped to user space. Blocking the signal hinders
* that tracking mechanism.
*/
sigdelset(&new_set, SIGSEGV);
pthread_sigmask(SIG_BLOCK, &new_set, &saved_set);
ret = thrd_create(thrd, routine, param);
pthread_sigmask(SIG_SETMASK, &saved_set, NULL);
#else
ret = thrd_create(thrd, routine, param);
#endif
return ret;
}
void u_thread_setname( const char *name )
{
#if defined(HAVE_PTHREAD)
#if DETECT_OS_LINUX || DETECT_OS_CYGWIN || DETECT_OS_SOLARIS || defined(__GLIBC__)
int ret = pthread_setname_np(pthread_self(), name);
if (ret == ERANGE) {
char buf[16];
const size_t len = MIN2(strlen(name), ARRAY_SIZE(buf) - 1);
memcpy(buf, name, len);
buf[len] = '\0';
pthread_setname_np(pthread_self(), buf);
}
#elif DETECT_OS_FREEBSD || DETECT_OS_OPENBSD
pthread_set_name_np(pthread_self(), name);
#elif DETECT_OS_NETBSD
pthread_setname_np(pthread_self(), "%s", (void *)name);
#elif DETECT_OS_APPLE
pthread_setname_np(name);
#elif DETECT_OS_HAIKU
rename_thread(find_thread(NULL), name);
#else
#warning Not sure how to call pthread_setname_np
#endif
#endif
(void)name;
}
bool
util_set_thread_affinity(thrd_t thread,
const uint32_t *mask,
uint32_t *old_mask,
unsigned num_mask_bits)
{
#if defined(HAVE_PTHREAD_SETAFFINITY)
cpu_set_t cpuset;
if (old_mask) {
if (pthread_getaffinity_np(thread, sizeof(cpuset), &cpuset) != 0)
return false;
memset(old_mask, 0, num_mask_bits / 8);
for (unsigned i = 0; i < num_mask_bits && i < CPU_SETSIZE; i++) {
if (CPU_ISSET(i, &cpuset))
old_mask[i / 32] |= 1u << (i % 32);
}
}
CPU_ZERO(&cpuset);
for (unsigned i = 0; i < num_mask_bits && i < CPU_SETSIZE; i++) {
if (mask[i / 32] & (1u << (i % 32)))
CPU_SET(i, &cpuset);
}
return pthread_setaffinity_np(thread, sizeof(cpuset), &cpuset) == 0;
#elif defined(_WIN32) && !defined(HAVE_PTHREAD)
DWORD_PTR m = mask[0];
if (sizeof(m) > 4 && num_mask_bits > 32)
m |= (uint64_t)mask[1] << 32;
m = SetThreadAffinityMask(thread.handle, m);
if (!m)
return false;
if (old_mask) {
memset(old_mask, 0, num_mask_bits / 8);
old_mask[0] = m;
#ifdef _WIN64
old_mask[1] = m >> 32;
#endif
}
return true;
#else
return false;
#endif
}
int64_t
util_thread_get_time_nano(thrd_t thread)
{
#if defined(HAVE_PTHREAD) && !defined(__APPLE__) && !defined(__HAIKU__)
struct timespec ts;
clockid_t cid;
pthread_getcpuclockid(thread, &cid);
clock_gettime(cid, &ts);
return (int64_t)ts.tv_sec * 1000000000 + ts.tv_nsec;
#elif defined(_WIN32)
union {
FILETIME time;
ULONGLONG value;
} kernel_time, user_time;
GetThreadTimes((HANDLE)thread.handle, NULL, NULL, &kernel_time.time, &user_time.time);
return (kernel_time.value + user_time.value) * 100;
#else
(void)thread;
return 0;
#endif
}
#if defined(HAVE_PTHREAD) && !defined(__APPLE__) && !defined(__HAIKU__)
void util_barrier_init(util_barrier *barrier, unsigned count)
{
pthread_barrier_init(barrier, NULL, count);
}
void util_barrier_destroy(util_barrier *barrier)
{
pthread_barrier_destroy(barrier);
}
bool util_barrier_wait(util_barrier *barrier)
{
return pthread_barrier_wait(barrier) == PTHREAD_BARRIER_SERIAL_THREAD;
}
#else /* If the OS doesn't have its own, implement barriers using a mutex and a condvar */
void util_barrier_init(util_barrier *barrier, unsigned count)
{
barrier->count = count;
barrier->waiters = 0;
barrier->sequence = 0;
(void) mtx_init(&barrier->mutex, mtx_plain);
cnd_init(&barrier->condvar);
}
void util_barrier_destroy(util_barrier *barrier)
{
assert(barrier->waiters == 0);
mtx_destroy(&barrier->mutex);
cnd_destroy(&barrier->condvar);
}
bool util_barrier_wait(util_barrier *barrier)
{
mtx_lock(&barrier->mutex);
assert(barrier->waiters < barrier->count);
barrier->waiters++;
if (barrier->waiters < barrier->count) {
uint64_t sequence = barrier->sequence;
do {
cnd_wait(&barrier->condvar, &barrier->mutex);
} while (sequence == barrier->sequence);
} else {
barrier->waiters = 0;
barrier->sequence++;
cnd_broadcast(&barrier->condvar);
}
mtx_unlock(&barrier->mutex);
return true;
}
#endif
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