libwebp-0.6.0-rc1

third_party/libwebp/utils/thread.c

Index: third_party/libwebp/utils/thread.c
diff --git a/third_party/libwebp/utils/thread.c b/third_party/libwebp/utils/thread.c
deleted file mode 100644
index 93f7622797f05f6acc1126e8296c481d276e4047..0000000000000000000000000000000000000000
--- a/third_party/libwebp/utils/thread.c
+++ /dev/null
@@ -1,358 +0,0 @@
-// Copyright 2011 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
-//
-// Author: Skal (pascal.massimino@gmail.com)
-
-#include <assert.h>
-#include <string.h>   // for memset()
-#include "./thread.h"
-#include "./utils.h"
-
-#ifdef WEBP_USE_THREAD
-
-#if defined(_WIN32)
-
-#include <windows.h>
-typedef HANDLE pthread_t;
-typedef CRITICAL_SECTION pthread_mutex_t;
-
-#if _WIN32_WINNT >= 0x0600  // Windows Vista / Server 2008 or greater
-#define USE_WINDOWS_CONDITION_VARIABLE
-typedef CONDITION_VARIABLE pthread_cond_t;
-#else
-typedef struct {
-  HANDLE waiting_sem_;
-  HANDLE received_sem_;
-  HANDLE signal_event_;
-} pthread_cond_t;
-#endif  // _WIN32_WINNT >= 0x600
-
-#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
-
-#else  // !_WIN32
-
-#include <pthread.h>
-
-#endif  // _WIN32
-
-struct WebPWorkerImpl {
-  pthread_mutex_t mutex_;
-  pthread_cond_t  condition_;
-  pthread_t       thread_;
-};
-
-#if defined(_WIN32)
-
-//------------------------------------------------------------------------------
-// simplistic pthread emulation layer
-
-#include <process.h>
-
-// _beginthreadex requires __stdcall
-#define THREADFN unsigned int __stdcall
-#define THREAD_RETURN(val) (unsigned int)((DWORD_PTR)val)
-
-#if _WIN32_WINNT >= 0x0501  // Windows XP or greater
-#define WaitForSingleObject(obj, timeout) \
-  WaitForSingleObjectEx(obj, timeout, FALSE /*bAlertable*/)
-#endif
-
-static 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 int pthread_join(pthread_t thread, void** value_ptr) {
-  (void)value_ptr;
-  return (WaitForSingleObject(thread, INFINITE) != WAIT_OBJECT_0 ||
-          CloseHandle(thread) == 0);
-}
-
-// Mutex
-static int pthread_mutex_init(pthread_mutex_t* const mutex, void* mutexattr) {
-  (void)mutexattr;
-#if _WIN32_WINNT >= 0x0600  // Windows Vista / Server 2008 or greater
-  InitializeCriticalSectionEx(mutex, 0 /*dwSpinCount*/, 0 /*Flags*/);
-#else
-  InitializeCriticalSection(mutex);
-#endif
-  return 0;
-}
-
-static int pthread_mutex_lock(pthread_mutex_t* const mutex) {
-  EnterCriticalSection(mutex);
-  return 0;
-}
-
-static int pthread_mutex_unlock(pthread_mutex_t* const mutex) {
-  LeaveCriticalSection(mutex);
-  return 0;
-}
-
-static int pthread_mutex_destroy(pthread_mutex_t* const mutex) {
-  DeleteCriticalSection(mutex);
-  return 0;
-}
-
-// Condition
-static int pthread_cond_destroy(pthread_cond_t* const condition) {
-  int ok = 1;
-#ifdef USE_WINDOWS_CONDITION_VARIABLE
-  (void)condition;
-#else
-  ok &= (CloseHandle(condition->waiting_sem_) != 0);
-  ok &= (CloseHandle(condition->received_sem_) != 0);
-  ok &= (CloseHandle(condition->signal_event_) != 0);
-#endif
-  return !ok;
-}
-
-static int pthread_cond_init(pthread_cond_t* const condition, void* cond_attr) {
-  (void)cond_attr;
-#ifdef USE_WINDOWS_CONDITION_VARIABLE
-  InitializeConditionVariable(condition);
-#else
-  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;
-  }
-#endif
-  return 0;
-}
-
-static int pthread_cond_signal(pthread_cond_t* const condition) {
-  int ok = 1;
-#ifdef USE_WINDOWS_CONDITION_VARIABLE
-  WakeConditionVariable(condition);
-#else
-  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);
-  }
-#endif
-  return !ok;
-}
-
-static int pthread_cond_wait(pthread_cond_t* const condition,
-                             pthread_mutex_t* const mutex) {
-  int ok;
-#ifdef USE_WINDOWS_CONDITION_VARIABLE
-  ok = SleepConditionVariableCS(condition, mutex, INFINITE);
-#else
-  // 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);
-#endif
-  return !ok;
-}
-
-#else  // !_WIN32
-# define THREADFN void*
-# define THREAD_RETURN(val) val
-#endif  // _WIN32
-
-//------------------------------------------------------------------------------
-
-static void Execute(WebPWorker* const worker);  // Forward declaration.
-
-static THREADFN ThreadLoop(void* ptr) {
-  WebPWorker* const worker = (WebPWorker*)ptr;
-  int done = 0;
-  while (!done) {
-    pthread_mutex_lock(&worker->impl_->mutex_);
-    while (worker->status_ == OK) {   // wait in idling mode
-      pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
-    }
-    if (worker->status_ == WORK) {
-      Execute(worker);
-      worker->status_ = OK;
-    } else if (worker->status_ == NOT_OK) {   // finish the worker
-      done = 1;
-    }
-    // signal to the main thread that we're done (for Sync())
-    pthread_cond_signal(&worker->impl_->condition_);
-    pthread_mutex_unlock(&worker->impl_->mutex_);
-  }
-  return THREAD_RETURN(NULL);    // Thread is finished
-}
-
-// main thread state control
-static void ChangeState(WebPWorker* const worker,
-                        WebPWorkerStatus new_status) {
-  // No-op when attempting to change state on a thread that didn't come up.
-  // Checking status_ without acquiring the lock first would result in a data
-  // race.
-  if (worker->impl_ == NULL) return;
-
-  pthread_mutex_lock(&worker->impl_->mutex_);
-  if (worker->status_ >= OK) {
-    // wait for the worker to finish
-    while (worker->status_ != OK) {
-      pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
-    }
-    // assign new status and release the working thread if needed
-    if (new_status != OK) {
-      worker->status_ = new_status;
-      pthread_cond_signal(&worker->impl_->condition_);
-    }
-  }
-  pthread_mutex_unlock(&worker->impl_->mutex_);
-}
-
-#endif  // WEBP_USE_THREAD
-
-//------------------------------------------------------------------------------
-
-static void Init(WebPWorker* const worker) {
-  memset(worker, 0, sizeof(*worker));
-  worker->status_ = NOT_OK;
-}
-
-static int Sync(WebPWorker* const worker) {
-#ifdef WEBP_USE_THREAD
-  ChangeState(worker, OK);
-#endif
-  assert(worker->status_ <= OK);
-  return !worker->had_error;
-}
-
-static int Reset(WebPWorker* const worker) {
-  int ok = 1;
-  worker->had_error = 0;
-  if (worker->status_ < OK) {
-#ifdef WEBP_USE_THREAD
-    worker->impl_ = (WebPWorkerImpl*)WebPSafeCalloc(1, sizeof(*worker->impl_));
-    if (worker->impl_ == NULL) {
-      return 0;
-    }
-    if (pthread_mutex_init(&worker->impl_->mutex_, NULL)) {
-      goto Error;
-    }
-    if (pthread_cond_init(&worker->impl_->condition_, NULL)) {
-      pthread_mutex_destroy(&worker->impl_->mutex_);
-      goto Error;
-    }
-    pthread_mutex_lock(&worker->impl_->mutex_);
-    ok = !pthread_create(&worker->impl_->thread_, NULL, ThreadLoop, worker);
-    if (ok) worker->status_ = OK;
-    pthread_mutex_unlock(&worker->impl_->mutex_);
-    if (!ok) {
-      pthread_mutex_destroy(&worker->impl_->mutex_);
-      pthread_cond_destroy(&worker->impl_->condition_);
- Error:
-      WebPSafeFree(worker->impl_);
-      worker->impl_ = NULL;
-      return 0;
-    }
-#else
-    worker->status_ = OK;
-#endif
-  } else if (worker->status_ > OK) {
-    ok = Sync(worker);
-  }
-  assert(!ok || (worker->status_ == OK));
-  return ok;
-}
-
-static void Execute(WebPWorker* const worker) {
-  if (worker->hook != NULL) {
-    worker->had_error |= !worker->hook(worker->data1, worker->data2);
-  }
-}
-
-static void Launch(WebPWorker* const worker) {
-#ifdef WEBP_USE_THREAD
-  ChangeState(worker, WORK);
-#else
-  Execute(worker);
-#endif
-}
-
-static void End(WebPWorker* const worker) {
-#ifdef WEBP_USE_THREAD
-  if (worker->impl_ != NULL) {
-    ChangeState(worker, NOT_OK);
-    pthread_join(worker->impl_->thread_, NULL);
-    pthread_mutex_destroy(&worker->impl_->mutex_);
-    pthread_cond_destroy(&worker->impl_->condition_);
-    WebPSafeFree(worker->impl_);
-    worker->impl_ = NULL;
-  }
-#else
-  worker->status_ = NOT_OK;
-  assert(worker->impl_ == NULL);
-#endif
-  assert(worker->status_ == NOT_OK);
-}
-
-//------------------------------------------------------------------------------
-
-static WebPWorkerInterface g_worker_interface = {
-  Init, Reset, Sync, Launch, Execute, End
-};
-
-int WebPSetWorkerInterface(const WebPWorkerInterface* const winterface) {
-  if (winterface == NULL ||
-      winterface->Init == NULL || winterface->Reset == NULL ||
-      winterface->Sync == NULL || winterface->Launch == NULL ||
-      winterface->Execute == NULL || winterface->End == NULL) {
-    return 0;
-  }
-  g_worker_interface = *winterface;
-  return 1;
-}
-
-const WebPWorkerInterface* WebPGetWorkerInterface(void) {
-  return &g_worker_interface;
-}
-
-//------------------------------------------------------------------------------