Squashed 'third_party/libevent/' content from commit d8ceae8
Change-Id: I84e1b23561eb225b9f288717b028e6bc9e5a27e1
git-subtree-dir: third_party/libevent
git-subtree-split: d8ceae81b83f3d0a56e2f41d4c429b2702a8e302
diff --git a/evthread_win32.c b/evthread_win32.c
new file mode 100644
index 0000000..fabd981
--- /dev/null
+++ b/evthread_win32.c
@@ -0,0 +1,339 @@
+/*
+ * Copyright 2009-2012 Niels Provos and Nick Mathewson
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "event2/event-config.h"
+
+#ifdef WIN32
+#ifndef _WIN32_WINNT
+/* Minimum required for InitializeCriticalSectionAndSpinCount */
+#define _WIN32_WINNT 0x0403
+#endif
+#include <winsock2.h>
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#undef WIN32_LEAN_AND_MEAN
+#include <sys/locking.h>
+#endif
+
+struct event_base;
+#include "event2/thread.h"
+
+#include "mm-internal.h"
+#include "evthread-internal.h"
+
+#define SPIN_COUNT 2000
+
+static void *
+evthread_win32_lock_create(unsigned locktype)
+{
+ CRITICAL_SECTION *lock = mm_malloc(sizeof(CRITICAL_SECTION));
+ if (!lock)
+ return NULL;
+ if (InitializeCriticalSectionAndSpinCount(lock, SPIN_COUNT) == 0) {
+ mm_free(lock);
+ return NULL;
+ }
+ return lock;
+}
+
+static void
+evthread_win32_lock_free(void *_lock, unsigned locktype)
+{
+ CRITICAL_SECTION *lock = _lock;
+ DeleteCriticalSection(lock);
+ mm_free(lock);
+}
+
+static int
+evthread_win32_lock(unsigned mode, void *_lock)
+{
+ CRITICAL_SECTION *lock = _lock;
+ if ((mode & EVTHREAD_TRY)) {
+ return ! TryEnterCriticalSection(lock);
+ } else {
+ EnterCriticalSection(lock);
+ return 0;
+ }
+}
+
+static int
+evthread_win32_unlock(unsigned mode, void *_lock)
+{
+ CRITICAL_SECTION *lock = _lock;
+ LeaveCriticalSection(lock);
+ return 0;
+}
+
+static unsigned long
+evthread_win32_get_id(void)
+{
+ return (unsigned long) GetCurrentThreadId();
+}
+
+#ifdef WIN32_HAVE_CONDITION_VARIABLES
+static void WINAPI (*InitializeConditionVariable_fn)(PCONDITION_VARIABLE)
+ = NULL;
+static BOOL WINAPI (*SleepConditionVariableCS_fn)(
+ PCONDITION_VARIABLE, PCRITICAL_SECTION, DWORD) = NULL;
+static void WINAPI (*WakeAllConditionVariable_fn)(PCONDITION_VARIABLE) = NULL;
+static void WINAPI (*WakeConditionVariable_fn)(PCONDITION_VARIABLE) = NULL;
+
+static int
+evthread_win32_condvar_init(void)
+{
+ HANDLE lib;
+
+ lib = GetModuleHandle(TEXT("kernel32.dll"));
+ if (lib == NULL)
+ return 0;
+
+#define LOAD(name) \
+ name##_fn = GetProcAddress(lib, #name)
+ LOAD(InitializeConditionVariable);
+ LOAD(SleepConditionVariableCS);
+ LOAD(WakeAllConditionVariable);
+ LOAD(WakeConditionVariable);
+
+ return InitializeConditionVariable_fn && SleepConditionVariableCS_fn &&
+ WakeAllConditionVariable_fn && WakeConditionVariable_fn;
+}
+
+/* XXXX Even if we can build this, we don't necessarily want to: the functions
+ * in question didn't exist before Vista, so we'd better LoadProc them. */
+static void *
+evthread_win32_condvar_alloc(unsigned condflags)
+{
+ CONDITION_VARIABLE *cond = mm_malloc(sizeof(CONDITION_VARIABLE));
+ if (!cond)
+ return NULL;
+ InitializeConditionVariable_fn(cond);
+ return cond;
+}
+
+static void
+evthread_win32_condvar_free(void *_cond)
+{
+ CONDITION_VARIABLE *cond = _cond;
+ /* There doesn't _seem_ to be a cleaup fn here... */
+ mm_free(cond);
+}
+
+static int
+evthread_win32_condvar_signal(void *_cond, int broadcast)
+{
+ CONDITION_VARIABLE *cond = _cond;
+ if (broadcast)
+ WakeAllConditionVariable_fn(cond);
+ else
+ WakeConditionVariable_fn(cond);
+ return 0;
+}
+
+static int
+evthread_win32_condvar_wait(void *_cond, void *_lock, const struct timeval *tv)
+{
+ CONDITION_VARIABLE *cond = _cond;
+ CRITICAL_SECTION *lock = _lock;
+ DWORD ms, err;
+ BOOL result;
+
+ if (tv)
+ ms = evutil_tv_to_msec(tv);
+ else
+ ms = INFINITE;
+ result = SleepConditionVariableCS_fn(cond, lock, ms);
+ if (result) {
+ if (GetLastError() == WAIT_TIMEOUT)
+ return 1;
+ else
+ return -1;
+ } else {
+ return 0;
+ }
+}
+#endif
+
+struct evthread_win32_cond {
+ HANDLE event;
+
+ CRITICAL_SECTION lock;
+ int n_waiting;
+ int n_to_wake;
+ int generation;
+};
+
+static void *
+evthread_win32_cond_alloc(unsigned flags)
+{
+ struct evthread_win32_cond *cond;
+ if (!(cond = mm_malloc(sizeof(struct evthread_win32_cond))))
+ return NULL;
+ if (InitializeCriticalSectionAndSpinCount(&cond->lock, SPIN_COUNT)==0) {
+ mm_free(cond);
+ return NULL;
+ }
+ if ((cond->event = CreateEvent(NULL,TRUE,FALSE,NULL)) == NULL) {
+ DeleteCriticalSection(&cond->lock);
+ mm_free(cond);
+ return NULL;
+ }
+ cond->n_waiting = cond->n_to_wake = cond->generation = 0;
+ return cond;
+}
+
+static void
+evthread_win32_cond_free(void *_cond)
+{
+ struct evthread_win32_cond *cond = _cond;
+ DeleteCriticalSection(&cond->lock);
+ CloseHandle(cond->event);
+ mm_free(cond);
+}
+
+static int
+evthread_win32_cond_signal(void *_cond, int broadcast)
+{
+ struct evthread_win32_cond *cond = _cond;
+ EnterCriticalSection(&cond->lock);
+ if (broadcast)
+ cond->n_to_wake = cond->n_waiting;
+ else
+ ++cond->n_to_wake;
+ cond->generation++;
+ SetEvent(cond->event);
+ LeaveCriticalSection(&cond->lock);
+ return 0;
+}
+
+static int
+evthread_win32_cond_wait(void *_cond, void *_lock, const struct timeval *tv)
+{
+ struct evthread_win32_cond *cond = _cond;
+ CRITICAL_SECTION *lock = _lock;
+ int generation_at_start;
+ int waiting = 1;
+ int result = -1;
+ DWORD ms = INFINITE, ms_orig = INFINITE, startTime, endTime;
+ if (tv)
+ ms_orig = ms = evutil_tv_to_msec(tv);
+
+ EnterCriticalSection(&cond->lock);
+ ++cond->n_waiting;
+ generation_at_start = cond->generation;
+ LeaveCriticalSection(&cond->lock);
+
+ LeaveCriticalSection(lock);
+
+ startTime = GetTickCount();
+ do {
+ DWORD res;
+ res = WaitForSingleObject(cond->event, ms);
+ EnterCriticalSection(&cond->lock);
+ if (cond->n_to_wake &&
+ cond->generation != generation_at_start) {
+ --cond->n_to_wake;
+ --cond->n_waiting;
+ result = 0;
+ waiting = 0;
+ goto out;
+ } else if (res != WAIT_OBJECT_0) {
+ result = (res==WAIT_TIMEOUT) ? 1 : -1;
+ --cond->n_waiting;
+ waiting = 0;
+ goto out;
+ } else if (ms != INFINITE) {
+ endTime = GetTickCount();
+ if (startTime + ms_orig <= endTime) {
+ result = 1; /* Timeout */
+ --cond->n_waiting;
+ waiting = 0;
+ goto out;
+ } else {
+ ms = startTime + ms_orig - endTime;
+ }
+ }
+ /* If we make it here, we are still waiting. */
+ if (cond->n_to_wake == 0) {
+ /* There is nobody else who should wake up; reset
+ * the event. */
+ ResetEvent(cond->event);
+ }
+ out:
+ LeaveCriticalSection(&cond->lock);
+ } while (waiting);
+
+ EnterCriticalSection(lock);
+
+ EnterCriticalSection(&cond->lock);
+ if (!cond->n_waiting)
+ ResetEvent(cond->event);
+ LeaveCriticalSection(&cond->lock);
+
+ return result;
+}
+
+int
+evthread_use_windows_threads(void)
+{
+ struct evthread_lock_callbacks cbs = {
+ EVTHREAD_LOCK_API_VERSION,
+ EVTHREAD_LOCKTYPE_RECURSIVE,
+ evthread_win32_lock_create,
+ evthread_win32_lock_free,
+ evthread_win32_lock,
+ evthread_win32_unlock
+ };
+
+
+ struct evthread_condition_callbacks cond_cbs = {
+ EVTHREAD_CONDITION_API_VERSION,
+ evthread_win32_cond_alloc,
+ evthread_win32_cond_free,
+ evthread_win32_cond_signal,
+ evthread_win32_cond_wait
+ };
+#ifdef WIN32_HAVE_CONDITION_VARIABLES
+ struct evthread_condition_callbacks condvar_cbs = {
+ EVTHREAD_CONDITION_API_VERSION,
+ evthread_win32_condvar_alloc,
+ evthread_win32_condvar_free,
+ evthread_win32_condvar_signal,
+ evthread_win32_condvar_wait
+ };
+#endif
+
+ evthread_set_lock_callbacks(&cbs);
+ evthread_set_id_callback(evthread_win32_get_id);
+#ifdef WIN32_HAVE_CONDITION_VARIABLES
+ if (evthread_win32_condvar_init()) {
+ evthread_set_condition_callbacks(&condvar_cbs);
+ return 0;
+ }
+#endif
+ evthread_set_condition_callbacks(&cond_cbs);
+
+ return 0;
+}
+