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// Copyright 2024 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// pthread.h wrapper
#ifndef VPX_VPX_UTIL_VPX_PTHREAD_H_
#define VPX_VPX_UTIL_VPX_PTHREAD_H_
#include "./vpx_config.h"
#if CONFIG_MULTITHREAD
#ifdef __cplusplus
extern "C" {
#endif
#if defined(_WIN32) && !HAVE_PTHREAD_H
// Prevent leaking max/min macros.
#undef NOMINMAX
#define NOMINMAX
#undef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#include <errno.h> // NOLINT
#include <process.h> // NOLINT
#include <stddef.h> // NOLINT
#include <windows.h> // NOLINT
typedef HANDLE pthread_t;
typedef CRITICAL_SECTION pthread_mutex_t;
#if _WIN32_WINNT < 0x0600
#error _WIN32_WINNT must target Windows Vista / Server 2008 or newer.
#endif
typedef CONDITION_VARIABLE pthread_cond_t;
#ifndef WINAPI_FAMILY_PARTITION
#define WINAPI_PARTITION_DESKTOP 1
#define WINAPI_FAMILY_PARTITION(x) x
#endif
#if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
#define USE_CREATE_THREAD
#endif
//------------------------------------------------------------------------------
// simplistic pthread emulation layer
// _beginthreadex requires __stdcall
#if defined(__GNUC__) && \
(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2))
#define THREADFN __attribute__((force_align_arg_pointer)) unsigned int __stdcall
#else
#define THREADFN unsigned int __stdcall
#endif
#define THREAD_EXIT_SUCCESS 0
static INLINE int pthread_create(pthread_t *const thread, const void *attr,
unsigned int(__stdcall *start)(void *),
void *arg) {
(void)attr;
#ifdef USE_CREATE_THREAD
*thread = CreateThread(NULL, /* lpThreadAttributes */
0, /* dwStackSize */
start, arg, 0, /* dwStackSize */
NULL); /* lpThreadId */
#else
*thread = (pthread_t)_beginthreadex(NULL, /* void *security */
0, /* unsigned stack_size */
start, arg, 0, /* unsigned initflag */
NULL); /* unsigned *thrdaddr */
#endif
if (*thread == NULL) return 1;
SetThreadPriority(*thread, THREAD_PRIORITY_ABOVE_NORMAL);
return 0;
}
static INLINE int pthread_join(pthread_t thread, void **value_ptr) {
(void)value_ptr;
return (WaitForSingleObjectEx(thread, INFINITE, FALSE /*bAlertable*/) !=
WAIT_OBJECT_0 ||
CloseHandle(thread) == 0);
}
// Mutex
static INLINE int pthread_mutex_init(pthread_mutex_t *const mutex,
void *mutexattr) {
(void)mutexattr;
InitializeCriticalSectionEx(mutex, 0 /*dwSpinCount*/, 0 /*Flags*/);
return 0;
}
static INLINE int pthread_mutex_trylock(pthread_mutex_t *const mutex) {
return TryEnterCriticalSection(mutex) ? 0 : EBUSY;
}
static INLINE int pthread_mutex_lock(pthread_mutex_t *const mutex) {
EnterCriticalSection(mutex);
return 0;
}
static INLINE int pthread_mutex_unlock(pthread_mutex_t *const mutex) {
LeaveCriticalSection(mutex);
return 0;
}
static INLINE int pthread_mutex_destroy(pthread_mutex_t *const mutex) {
DeleteCriticalSection(mutex);
return 0;
}
// Condition
static INLINE int pthread_cond_destroy(pthread_cond_t *const condition) {
(void)condition;
return 0;
}
static INLINE int pthread_cond_init(pthread_cond_t *const condition,
void *cond_attr) {
(void)cond_attr;
InitializeConditionVariable(condition);
return 0;
}
static INLINE int pthread_cond_signal(pthread_cond_t *const condition) {
WakeConditionVariable(condition);
return 0;
}
static INLINE int pthread_cond_broadcast(pthread_cond_t *const condition) {
WakeAllConditionVariable(condition);
return 0;
}
static INLINE int pthread_cond_wait(pthread_cond_t *const condition,
pthread_mutex_t *const mutex) {
int ok;
ok = SleepConditionVariableCS(condition, mutex, INFINITE);
return !ok;
}
#else // _WIN32
#include <pthread.h> // NOLINT
#define THREADFN void *
#define THREAD_EXIT_SUCCESS NULL
#endif
#ifdef __cplusplus
} // extern "C"
#endif
#endif // CONFIG_MULTITHREAD
#endif // VPX_VPX_UTIL_VPX_PTHREAD_H_
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