libvpx: Pull from upstream

source/libvpx/vp9/decoder/vp9_thread.h

Index: source/libvpx/vp9/decoder/vp9_thread.h
===================================================================
--- source/libvpx/vp9/decoder/vp9_thread.h	(revision 282873)
+++ source/libvpx/vp9/decoder/vp9_thread.h	(working copy)
@@ -1,219 +0,0 @@
-// Copyright 2013 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.
-// -----------------------------------------------------------------------------
-//
-// Multi-threaded worker
-//
-// Original source:
-//  http://git.chromium.org/webm/libwebp.git
-//  100644 blob 7bd451b124ae3b81596abfbcc823e3cb129d3a38  src/utils/thread.h
-
-#ifndef VP9_DECODER_VP9_THREAD_H_
-#define VP9_DECODER_VP9_THREAD_H_
-
-#include "./vpx_config.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#if CONFIG_MULTITHREAD
-
-#if defined(_WIN32)
-#include <errno.h>  // NOLINT
-#include <process.h>  // NOLINT
-#include <windows.h>  // NOLINT
-typedef HANDLE pthread_t;
-typedef CRITICAL_SECTION pthread_mutex_t;
-typedef struct {
-  HANDLE waiting_sem_;
-  HANDLE received_sem_;
-  HANDLE signal_event_;
-} pthread_cond_t;
-
-//------------------------------------------------------------------------------
-// simplistic pthread emulation layer
-
-// _beginthreadex requires __stdcall
-#define THREADFN unsigned int __stdcall
-#define THREAD_RETURN(val) (unsigned int)((DWORD_PTR)val)
-
-static INLINE int pthread_create(pthread_t* const thread, const void* attr,
-                                 unsigned int (__stdcall *start)(void*),
-                                 void* arg) {
-  (void)attr;
-  *thread = (pthread_t)_beginthreadex(NULL,   /* void *security */
-                                      0,      /* unsigned stack_size */
-                                      start,
-                                      arg,
-                                      0,      /* unsigned initflag */
-                                      NULL);  /* unsigned *thrdaddr */
-  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 (WaitForSingleObject(thread, INFINITE) != WAIT_OBJECT_0 ||
-          CloseHandle(thread) == 0);
-}
-
-// Mutex
-static INLINE int pthread_mutex_init(pthread_mutex_t *const mutex,
-                                     void* mutexattr) {
-  (void)mutexattr;
-  InitializeCriticalSection(mutex);
-  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) {
-  int ok = 1;
-  ok &= (CloseHandle(condition->waiting_sem_) != 0);
-  ok &= (CloseHandle(condition->received_sem_) != 0);
-  ok &= (CloseHandle(condition->signal_event_) != 0);
-  return !ok;
-}
-
-static INLINE int pthread_cond_init(pthread_cond_t *const condition,
-                                    void* cond_attr) {
-  (void)cond_attr;
-  condition->waiting_sem_ = CreateSemaphore(NULL, 0, 1, NULL);
-  condition->received_sem_ = CreateSemaphore(NULL, 0, 1, NULL);
-  condition->signal_event_ = CreateEvent(NULL, FALSE, FALSE, NULL);
-  if (condition->waiting_sem_ == NULL ||
-      condition->received_sem_ == NULL ||
-      condition->signal_event_ == NULL) {
-    pthread_cond_destroy(condition);
-    return 1;
-  }
-  return 0;
-}
-
-static INLINE int pthread_cond_signal(pthread_cond_t *const condition) {
-  int ok = 1;
-  if (WaitForSingleObject(condition->waiting_sem_, 0) == WAIT_OBJECT_0) {
-    // a thread is waiting in pthread_cond_wait: allow it to be notified
-    ok = SetEvent(condition->signal_event_);
-    // wait until the event is consumed so the signaler cannot consume
-    // the event via its own pthread_cond_wait.
-    ok &= (WaitForSingleObject(condition->received_sem_, INFINITE) !=
-           WAIT_OBJECT_0);
-  }
-  return !ok;
-}
-
-static INLINE int pthread_cond_wait(pthread_cond_t *const condition,
-                                    pthread_mutex_t *const mutex) {
-  int ok;
-  // note that there is a consumer available so the signal isn't dropped in
-  // pthread_cond_signal
-  if (!ReleaseSemaphore(condition->waiting_sem_, 1, NULL))
-    return 1;
-  // now unlock the mutex so pthread_cond_signal may be issued
-  pthread_mutex_unlock(mutex);
-  ok = (WaitForSingleObject(condition->signal_event_, INFINITE) ==
-        WAIT_OBJECT_0);
-  ok &= ReleaseSemaphore(condition->received_sem_, 1, NULL);
-  pthread_mutex_lock(mutex);
-  return !ok;
-}
-#else  // _WIN32
-#include <pthread.h> // NOLINT
-# define THREADFN void*
-# define THREAD_RETURN(val) val
-#endif
-
-#endif  // CONFIG_MULTITHREAD
-
-// State of the worker thread object
-typedef enum {
-  NOT_OK = 0,   // object is unusable
-  OK,           // ready to work
-  WORK          // busy finishing the current task
-} VP9WorkerStatus;
-
-// Function to be called by the worker thread. Takes two opaque pointers as
-// arguments (data1 and data2), and should return false in case of error.
-typedef int (*VP9WorkerHook)(void*, void*);
-
-// Platform-dependent implementation details for the worker.
-typedef struct VP9WorkerImpl VP9WorkerImpl;
-
-// Synchronization object used to launch job in the worker thread
-typedef struct {
-  VP9WorkerImpl *impl_;
-  VP9WorkerStatus status_;
-  VP9WorkerHook hook;     // hook to call
-  void *data1;            // first argument passed to 'hook'
-  void *data2;            // second argument passed to 'hook'
-  int had_error;          // return value of the last call to 'hook'
-} VP9Worker;
-
-// The interface for all thread-worker related functions. All these functions
-// must be implemented.
-typedef struct {
-  // Must be called first, before any other method.
-  void (*init)(VP9Worker *const worker);
-  // Must be called to initialize the object and spawn the thread. Re-entrant.
-  // Will potentially launch the thread. Returns false in case of error.
-  int (*reset)(VP9Worker *const worker);
-  // Makes sure the previous work is finished. Returns true if worker->had_error
-  // was not set and no error condition was triggered by the working thread.
-  int (*sync)(VP9Worker *const worker);
-  // Triggers the thread to call hook() with data1 and data2 arguments. These
-  // hook/data1/data2 values can be changed at any time before calling this
-  // function, but not be changed afterward until the next call to Sync().
-  void (*launch)(VP9Worker *const worker);
-  // This function is similar to launch() except that it calls the
-  // hook directly instead of using a thread. Convenient to bypass the thread
-  // mechanism while still using the VP9Worker structs. sync() must
-  // still be called afterward (for error reporting).
-  void (*execute)(VP9Worker *const worker);
-  // Kill the thread and terminate the object. To use the object again, one
-  // must call reset() again.
-  void (*end)(VP9Worker *const worker);
-} VP9WorkerInterface;
-
-// Install a new set of threading functions, overriding the defaults. This
-// should be done before any workers are started, i.e., before any encoding or
-// decoding takes place. The contents of the interface struct are copied, it
-// is safe to free the corresponding memory after this call. This function is
-// not thread-safe. Return false in case of invalid pointer or methods.
-int vp9_set_worker_interface(const VP9WorkerInterface *const winterface);
-
-// Retrieve the currently set thread worker interface.
-const VP9WorkerInterface *vp9_get_worker_interface(void);
-
-//------------------------------------------------------------------------------
-
-#ifdef __cplusplus
-}    // extern "C"
-#endif
-
-#endif  // VP9_DECODER_VP9_THREAD_H_