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