threading.c

/*
Copyright (c) 2013. The YARA Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

#include <fcntl.h>

#if !defined(_WIN32) && !defined(__CYGWIN__)
#include <errno.h>
#endif

#include "threading.h"


int mutex_init(
    MUTEX* mutex)
{
  #if defined(_WIN32) || defined(__CYGWIN__)
  *mutex = CreateMutex(NULL, FALSE, NULL);
  if (*mutex == NULL)
    return GetLastError();
  else
    return 0;
  #else
  return pthread_mutex_init(mutex, NULL);
  #endif
}

void mutex_destroy(
    MUTEX* mutex)
{
  #if defined(_WIN32) || defined(__CYGWIN__)
  CloseHandle(*mutex);
  #else
  pthread_mutex_destroy(mutex);
  #endif
}


void mutex_lock(
    MUTEX* mutex)
{
  #if defined(_WIN32) || defined(__CYGWIN__)
  WaitForSingleObject(*mutex, INFINITE);
  #else
  pthread_mutex_lock(mutex);
  #endif
}


void mutex_unlock(
    MUTEX* mutex)
{
  #if defined(_WIN32) || defined(__CYGWIN__)
  ReleaseMutex(*mutex);
  #else
  pthread_mutex_unlock(mutex);
  #endif
}


int semaphore_init(
    SEMAPHORE* semaphore,
    int value)
{
  #if defined(_WIN32) || defined(__CYGWIN__)
  *semaphore = CreateSemaphore(NULL, value, 65535, NULL);
  if (*semaphore == NULL)
    return GetLastError();
  #else
  // Mac OS X doesn't support unnamed semaphores via sem_init, that's why
  // we use sem_open instead sem_init and immediately unlink the semaphore
  // from the name. More info at:
  //
  // http://stackoverflow.com/questions/1413785/sem-init-on-os-x
  *semaphore = sem_open("/semaphore", O_CREAT, S_IRUSR, value);

  if (*semaphore == SEM_FAILED)
    return errno;

  if (sem_unlink("/semaphore") != 0)
    return errno;
  #endif

  return 0;
}


void semaphore_destroy(
    SEMAPHORE* semaphore)
{
  #if defined(_WIN32) || defined(__CYGWIN__)
  CloseHandle(*semaphore);
  #else
  sem_close(*semaphore);
  #endif
}


void semaphore_wait(
    SEMAPHORE* semaphore)
{
  #if defined(_WIN32) || defined(__CYGWIN__)
  WaitForSingleObject(*semaphore, INFINITE);
  #else
  sem_wait(*semaphore);
  #endif
}


void semaphore_release(
    SEMAPHORE* semaphore)
{
  #if defined(_WIN32) || defined(__CYGWIN__)
  ReleaseSemaphore(*semaphore, 1, NULL);
  #else
  sem_post(*semaphore);
  #endif
}


int create_thread(
    THREAD* thread,
    THREAD_START_ROUTINE start_routine,
    void* param)
{
  #if defined(_WIN32) || defined(__CYGWIN__)
  *thread = CreateThread(NULL, 0, start_routine, param, 0, NULL);
  if (*thread == NULL)
    return GetLastError();
  else
    return 0;
  #else
  return pthread_create(thread, NULL, start_routine, param);
  #endif
}


void thread_join(
    THREAD* thread)
{
  #if defined(_WIN32) || defined(__CYGWIN__)
  WaitForSingleObject(*thread, INFINITE);
  #else
  pthread_join(*thread, NULL);
  #endif
}