342 lines
8.4 KiB
C
342 lines
8.4 KiB
C
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/*
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* Copyright 2009-2012 Niels Provos and Nick Mathewson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "event2/event-config.h"
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#include "evconfig-private.h"
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#ifdef _WIN32
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#ifndef _WIN32_WINNT
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/* Minimum required for InitializeCriticalSectionAndSpinCount */
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#define _WIN32_WINNT 0x0403
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#endif
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#include <winsock2.h>
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#undef WIN32_LEAN_AND_MEAN
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#include <sys/locking.h>
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#endif
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struct event_base;
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#include "event2/thread.h"
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#include "mm-internal.h"
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#include "evthread-internal.h"
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#include "time-internal.h"
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#define SPIN_COUNT 2000
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static void *
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evthread_win32_lock_create(unsigned locktype)
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{
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CRITICAL_SECTION *lock = mm_malloc(sizeof(CRITICAL_SECTION));
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if (!lock)
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return NULL;
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if (InitializeCriticalSectionAndSpinCount(lock, SPIN_COUNT) == 0) {
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mm_free(lock);
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return NULL;
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}
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return lock;
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}
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static void
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evthread_win32_lock_free(void *lock_, unsigned locktype)
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{
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CRITICAL_SECTION *lock = lock_;
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DeleteCriticalSection(lock);
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mm_free(lock);
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}
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static int
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evthread_win32_lock(unsigned mode, void *lock_)
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{
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CRITICAL_SECTION *lock = lock_;
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if ((mode & EVTHREAD_TRY)) {
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return ! TryEnterCriticalSection(lock);
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} else {
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EnterCriticalSection(lock);
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return 0;
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}
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}
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static int
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evthread_win32_unlock(unsigned mode, void *lock_)
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{
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CRITICAL_SECTION *lock = lock_;
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LeaveCriticalSection(lock);
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return 0;
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}
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static unsigned long
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evthread_win32_get_id(void)
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{
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return (unsigned long) GetCurrentThreadId();
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}
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#ifdef WIN32_HAVE_CONDITION_VARIABLES
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static void WINAPI (*InitializeConditionVariable_fn)(PCONDITION_VARIABLE)
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= NULL;
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static BOOL WINAPI (*SleepConditionVariableCS_fn)(
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PCONDITION_VARIABLE, PCRITICAL_SECTION, DWORD) = NULL;
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static void WINAPI (*WakeAllConditionVariable_fn)(PCONDITION_VARIABLE) = NULL;
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static void WINAPI (*WakeConditionVariable_fn)(PCONDITION_VARIABLE) = NULL;
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static int
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evthread_win32_condvar_init(void)
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{
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HANDLE lib;
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lib = GetModuleHandle(TEXT("kernel32.dll"));
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if (lib == NULL)
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return 0;
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#define LOAD(name) \
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name##_fn = GetProcAddress(lib, #name)
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LOAD(InitializeConditionVariable);
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LOAD(SleepConditionVariableCS);
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LOAD(WakeAllConditionVariable);
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LOAD(WakeConditionVariable);
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return InitializeConditionVariable_fn && SleepConditionVariableCS_fn &&
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WakeAllConditionVariable_fn && WakeConditionVariable_fn;
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}
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/* XXXX Even if we can build this, we don't necessarily want to: the functions
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* in question didn't exist before Vista, so we'd better LoadProc them. */
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static void *
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evthread_win32_condvar_alloc(unsigned condflags)
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{
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CONDITION_VARIABLE *cond = mm_malloc(sizeof(CONDITION_VARIABLE));
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if (!cond)
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return NULL;
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InitializeConditionVariable_fn(cond);
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return cond;
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}
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static void
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evthread_win32_condvar_free(void *cond_)
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{
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CONDITION_VARIABLE *cond = cond_;
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/* There doesn't _seem_ to be a cleaup fn here... */
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mm_free(cond);
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}
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static int
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evthread_win32_condvar_signal(void *cond, int broadcast)
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{
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CONDITION_VARIABLE *cond = cond_;
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if (broadcast)
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WakeAllConditionVariable_fn(cond);
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else
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WakeConditionVariable_fn(cond);
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return 0;
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}
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static int
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evthread_win32_condvar_wait(void *cond_, void *lock_, const struct timeval *tv)
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{
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CONDITION_VARIABLE *cond = cond_;
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CRITICAL_SECTION *lock = lock_;
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DWORD ms, err;
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BOOL result;
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if (tv)
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ms = evutil_tv_to_msec_(tv);
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else
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ms = INFINITE;
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result = SleepConditionVariableCS_fn(cond, lock, ms);
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if (result) {
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if (GetLastError() == WAIT_TIMEOUT)
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return 1;
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else
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return -1;
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} else {
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return 0;
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}
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}
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#endif
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struct evthread_win32_cond {
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HANDLE event;
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CRITICAL_SECTION lock;
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int n_waiting;
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int n_to_wake;
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int generation;
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};
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static void *
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evthread_win32_cond_alloc(unsigned flags)
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{
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struct evthread_win32_cond *cond;
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if (!(cond = mm_malloc(sizeof(struct evthread_win32_cond))))
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return NULL;
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if (InitializeCriticalSectionAndSpinCount(&cond->lock, SPIN_COUNT)==0) {
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mm_free(cond);
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return NULL;
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}
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if ((cond->event = CreateEvent(NULL,TRUE,FALSE,NULL)) == NULL) {
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DeleteCriticalSection(&cond->lock);
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mm_free(cond);
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return NULL;
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}
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cond->n_waiting = cond->n_to_wake = cond->generation = 0;
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return cond;
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}
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static void
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evthread_win32_cond_free(void *cond_)
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{
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struct evthread_win32_cond *cond = cond_;
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DeleteCriticalSection(&cond->lock);
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CloseHandle(cond->event);
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mm_free(cond);
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}
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static int
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evthread_win32_cond_signal(void *cond_, int broadcast)
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{
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struct evthread_win32_cond *cond = cond_;
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EnterCriticalSection(&cond->lock);
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if (broadcast)
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cond->n_to_wake = cond->n_waiting;
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else
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++cond->n_to_wake;
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cond->generation++;
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SetEvent(cond->event);
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LeaveCriticalSection(&cond->lock);
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return 0;
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}
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static int
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evthread_win32_cond_wait(void *cond_, void *lock_, const struct timeval *tv)
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{
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struct evthread_win32_cond *cond = cond_;
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CRITICAL_SECTION *lock = lock_;
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int generation_at_start;
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int waiting = 1;
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int result = -1;
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DWORD ms = INFINITE, ms_orig = INFINITE, startTime, endTime;
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if (tv)
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ms_orig = ms = evutil_tv_to_msec_(tv);
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EnterCriticalSection(&cond->lock);
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++cond->n_waiting;
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generation_at_start = cond->generation;
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LeaveCriticalSection(&cond->lock);
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LeaveCriticalSection(lock);
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startTime = GetTickCount();
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do {
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DWORD res;
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res = WaitForSingleObject(cond->event, ms);
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EnterCriticalSection(&cond->lock);
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if (cond->n_to_wake &&
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cond->generation != generation_at_start) {
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--cond->n_to_wake;
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--cond->n_waiting;
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result = 0;
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waiting = 0;
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goto out;
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} else if (res != WAIT_OBJECT_0) {
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result = (res==WAIT_TIMEOUT) ? 1 : -1;
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--cond->n_waiting;
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waiting = 0;
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goto out;
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} else if (ms != INFINITE) {
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endTime = GetTickCount();
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if (startTime + ms_orig <= endTime) {
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result = 1; /* Timeout */
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--cond->n_waiting;
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waiting = 0;
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goto out;
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} else {
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ms = startTime + ms_orig - endTime;
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}
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}
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/* If we make it here, we are still waiting. */
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if (cond->n_to_wake == 0) {
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/* There is nobody else who should wake up; reset
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* the event. */
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ResetEvent(cond->event);
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}
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out:
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LeaveCriticalSection(&cond->lock);
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} while (waiting);
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EnterCriticalSection(lock);
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EnterCriticalSection(&cond->lock);
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if (!cond->n_waiting)
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ResetEvent(cond->event);
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LeaveCriticalSection(&cond->lock);
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return result;
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}
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int
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evthread_use_windows_threads(void)
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{
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struct evthread_lock_callbacks cbs = {
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EVTHREAD_LOCK_API_VERSION,
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EVTHREAD_LOCKTYPE_RECURSIVE,
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evthread_win32_lock_create,
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evthread_win32_lock_free,
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evthread_win32_lock,
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evthread_win32_unlock
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};
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struct evthread_condition_callbacks cond_cbs = {
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EVTHREAD_CONDITION_API_VERSION,
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evthread_win32_cond_alloc,
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evthread_win32_cond_free,
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evthread_win32_cond_signal,
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evthread_win32_cond_wait
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};
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#ifdef WIN32_HAVE_CONDITION_VARIABLES
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struct evthread_condition_callbacks condvar_cbs = {
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EVTHREAD_CONDITION_API_VERSION,
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evthread_win32_condvar_alloc,
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evthread_win32_condvar_free,
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evthread_win32_condvar_signal,
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evthread_win32_condvar_wait
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};
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#endif
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evthread_set_lock_callbacks(&cbs);
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evthread_set_id_callback(evthread_win32_get_id);
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#ifdef WIN32_HAVE_CONDITION_VARIABLES
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if (evthread_win32_condvar_init()) {
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evthread_set_condition_callbacks(&condvar_cbs);
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return 0;
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}
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#endif
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evthread_set_condition_callbacks(&cond_cbs);
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return 0;
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}
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