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- #ifndef THR_COND_INCLUDED
- #define THR_COND_INCLUDED
- /* Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License, version 2.0,
- as published by the Free Software Foundation.
- This program is also distributed with certain software (including
- but not limited to OpenSSL) that is licensed under separate terms,
- as designated in a particular file or component or in included license
- documentation. The authors of MySQL hereby grant you an additional
- permission to link the program and your derivative works with the
- separately licensed software that they have included with MySQL.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License, version 2.0, for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
- /**
- @file include/thr_cond.h
- MySQL condition variable implementation.
- There are three "layers":
- 1) native_cond_*()
- Functions that map directly down to OS primitives.
- Windows - ConditionVariable
- Other OSes - pthread
- 2) my_cond_*()
- Functions that use SAFE_MUTEX (default for debug).
- Otherwise native_cond_*() is used.
- 3) mysql_cond*()
- Functions that include Performance Schema instrumentation.
- See include/mysql/psi/mysql_thread.h
- */
- #include <stddef.h>
- #include <sys/types.h>
- #ifdef _WIN32
- #include <time.h>
- #include "my_systime.h"
- #endif
- #include "my_macros.h"
- #include "my_thread.h"
- #include "mysql/components/services/thr_cond_bits.h"
- #include "thr_mutex.h"
- #ifdef _WIN32
- /**
- Convert abstime to milliseconds
- */
- static DWORD get_milliseconds(const struct timespec *abstime) {
- /*
- Convert timespec to millis and subtract current time.
- my_getsystime() returns time in 100 ns units.
- */
- ulonglong future = abstime->tv_sec * 1000 + abstime->tv_nsec / 1000000;
- ulonglong now = my_getsystime() / 10000;
- /* Don't allow the timeout to be negative. */
- if (future < now) return 0;
- return (DWORD)(future - now);
- }
- #endif /* _WIN32 */
- static inline int native_cond_init(native_cond_t *cond) {
- #ifdef _WIN32
- InitializeConditionVariable(cond);
- return 0;
- #else
- /* pthread_condattr_t is not used in MySQL */
- return pthread_cond_init(cond, NULL);
- #endif
- }
- static inline int native_cond_destroy(
- native_cond_t *cond MY_ATTRIBUTE((unused))) {
- #ifdef _WIN32
- return 0; /* no destroy function */
- #else
- return pthread_cond_destroy(cond);
- #endif
- }
- static inline int native_cond_timedwait(native_cond_t *cond,
- native_mutex_t *mutex,
- const struct timespec *abstime) {
- #ifdef _WIN32
- DWORD timeout = get_milliseconds(abstime);
- if (!SleepConditionVariableCS(cond, mutex, timeout)) return ETIMEDOUT;
- return 0;
- #else
- return pthread_cond_timedwait(cond, mutex, abstime);
- #endif
- }
- static inline int native_cond_wait(native_cond_t *cond, native_mutex_t *mutex) {
- #ifdef _WIN32
- if (!SleepConditionVariableCS(cond, mutex, INFINITE)) return ETIMEDOUT;
- return 0;
- #else
- return pthread_cond_wait(cond, mutex);
- #endif
- }
- static inline int native_cond_signal(native_cond_t *cond) {
- #ifdef _WIN32
- WakeConditionVariable(cond);
- return 0;
- #else
- return pthread_cond_signal(cond);
- #endif
- }
- static inline int native_cond_broadcast(native_cond_t *cond) {
- #ifdef _WIN32
- WakeAllConditionVariable(cond);
- return 0;
- #else
- return pthread_cond_broadcast(cond);
- #endif
- }
- #ifdef SAFE_MUTEX
- int safe_cond_wait(native_cond_t *cond, safe_mutex_t *mp, const char *file,
- uint line);
- int safe_cond_timedwait(native_cond_t *cond, safe_mutex_t *mp,
- const struct timespec *abstime, const char *file,
- uint line);
- #endif
- static inline int my_cond_timedwait(native_cond_t *cond, my_mutex_t *mp,
- const struct timespec *abstime
- #ifdef SAFE_MUTEX
- ,
- const char *file, uint line
- #endif
- ) {
- #ifdef SAFE_MUTEX
- return safe_cond_timedwait(cond, mp->m_u.m_safe_ptr, abstime, file, line);
- #else
- return native_cond_timedwait(cond, &mp->m_u.m_native, abstime);
- #endif
- }
- static inline int my_cond_wait(native_cond_t *cond, my_mutex_t *mp
- #ifdef SAFE_MUTEX
- ,
- const char *file, uint line
- #endif
- ) {
- #ifdef SAFE_MUTEX
- return safe_cond_wait(cond, mp->m_u.m_safe_ptr, file, line);
- #else
- return native_cond_wait(cond, &mp->m_u.m_native);
- #endif
- }
- #endif /* THR_COND_INCLUDED */
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