1 /**************************************************************************
3 * Copyright 1999-2006 Brian Paul
4 * Copyright 2008 VMware, Inc.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
25 **************************************************************************/
33 #include "c11/threads.h"
34 #include "detect_os.h"
38 #ifdef PTHREAD_SETAFFINITY_IN_NP_HEADER
39 #include <pthread_np.h>
48 #define cpu_set_t cpuset_t
51 static inline thrd_t
u_thread_create(int (*routine
)(void *), void *param
)
55 sigset_t saved_set
, new_set
;
59 sigdelset(&new_set
, SIGSYS
);
60 pthread_sigmask(SIG_BLOCK
, &new_set
, &saved_set
);
61 ret
= thrd_create( &thread
, routine
, param
);
62 pthread_sigmask(SIG_SETMASK
, &saved_set
, NULL
);
65 ret
= thrd_create( &thread
, routine
, param
);
73 static inline void u_thread_setname( const char *name
)
75 #if defined(HAVE_PTHREAD)
76 #if DETECT_OS_LINUX || DETECT_OS_CYGWIN || DETECT_OS_SOLARIS
77 pthread_setname_np(pthread_self(), name
);
78 #elif DETECT_OS_FREEBSD || DETECT_OS_OPENBSD
79 pthread_set_name_np(pthread_self(), name
);
80 #elif DETECT_OS_NETBSD
81 pthread_setname_np(pthread_self(), "%s", (void *)name
);
83 pthread_setname_np(name
);
85 rename_thread(find_thread(NULL
), name
);
87 #warning Not sure how to call pthread_setname_np
94 * An AMD Zen CPU consists of multiple modules where each module has its own L3
95 * cache. Inter-thread communication such as locks and atomics between modules
96 * is very expensive. It's desirable to pin a group of closely cooperating
97 * threads to one group of cores sharing L3.
99 * \param thread thread
100 * \param L3_index index of the L3 cache
101 * \param cores_per_L3 number of CPU cores shared by one L3
104 util_pin_thread_to_L3(thrd_t thread
, unsigned L3_index
, unsigned cores_per_L3
)
106 #if defined(HAVE_PTHREAD_SETAFFINITY)
110 for (unsigned i
= 0; i
< cores_per_L3
; i
++)
111 CPU_SET(L3_index
* cores_per_L3
+ i
, &cpuset
);
112 pthread_setaffinity_np(thread
, sizeof(cpuset
), &cpuset
);
117 * Return the index of L3 that the thread is pinned to. If the thread is
118 * pinned to multiple L3 caches, return -1.
120 * \param thread thread
121 * \param cores_per_L3 number of CPU cores shared by one L3
124 util_get_L3_for_pinned_thread(thrd_t thread
, unsigned cores_per_L3
)
126 #if defined(HAVE_PTHREAD_SETAFFINITY)
129 if (pthread_getaffinity_np(thread
, sizeof(cpuset
), &cpuset
) == 0) {
132 for (unsigned i
= 0; i
< CPU_SETSIZE
; i
++) {
133 if (CPU_ISSET(i
, &cpuset
)) {
134 int x
= i
/ cores_per_L3
;
140 return -1; /* multiple L3s are set */
154 /* Return the time of a thread's CPU time clock. */
155 static inline int64_t
156 u_thread_get_time_nano(thrd_t thread
)
158 #if defined(HAVE_PTHREAD) && !defined(__APPLE__) && !defined(__HAIKU__)
162 pthread_getcpuclockid(thread
, &cid
);
163 clock_gettime(cid
, &ts
);
164 return (int64_t)ts
.tv_sec
* 1000000000 + ts
.tv_nsec
;
170 static inline bool u_thread_is_self(thrd_t thread
)
172 #if defined(HAVE_PTHREAD)
173 return pthread_equal(pthread_self(), thread
);
182 #if defined(HAVE_PTHREAD) && !defined(__APPLE__)
184 typedef pthread_barrier_t util_barrier
;
186 static inline void util_barrier_init(util_barrier
*barrier
, unsigned count
)
188 pthread_barrier_init(barrier
, NULL
, count
);
191 static inline void util_barrier_destroy(util_barrier
*barrier
)
193 pthread_barrier_destroy(barrier
);
196 static inline void util_barrier_wait(util_barrier
*barrier
)
198 pthread_barrier_wait(barrier
);
202 #else /* If the OS doesn't have its own, implement barriers using a mutex and a condvar */
212 static inline void util_barrier_init(util_barrier
*barrier
, unsigned count
)
214 barrier
->count
= count
;
215 barrier
->waiters
= 0;
216 barrier
->sequence
= 0;
217 (void) mtx_init(&barrier
->mutex
, mtx_plain
);
218 cnd_init(&barrier
->condvar
);
221 static inline void util_barrier_destroy(util_barrier
*barrier
)
223 assert(barrier
->waiters
== 0);
224 mtx_destroy(&barrier
->mutex
);
225 cnd_destroy(&barrier
->condvar
);
228 static inline void util_barrier_wait(util_barrier
*barrier
)
230 mtx_lock(&barrier
->mutex
);
232 assert(barrier
->waiters
< barrier
->count
);
235 if (barrier
->waiters
< barrier
->count
) {
236 uint64_t sequence
= barrier
->sequence
;
239 cnd_wait(&barrier
->condvar
, &barrier
->mutex
);
240 } while (sequence
== barrier
->sequence
);
242 barrier
->waiters
= 0;
244 cnd_broadcast(&barrier
->condvar
);
247 mtx_unlock(&barrier
->mutex
);
252 #endif /* U_THREAD_H_ */