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//===-- llvm/Support/ThreadSupport-PThreads.h - PThreads support *- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines pthreads implementations of the generic threading
// mechanisms. Users should never #include this file directly!
//
//===----------------------------------------------------------------------===//
// Users should never #include this file directly! As such, no include guards
// are needed.
#ifndef LLVM_SUPPORT_THREADSUPPORT_H
#error "Code should not #include Support/ThreadSupport/PThreads.h directly!"
#endif
#include <pthread.h>
namespace llvm {
/// Mutex - This class allows user code to protect variables shared between
/// threads. It implements a "recursive" mutex, to simplify user code.
///
class Mutex {
pthread_mutex_t mutex;
Mutex(const Mutex &); // DO NOT IMPLEMENT
void operator=(const Mutex &); // DO NOT IMPLEMENT
public:
Mutex() {
// Initialize the mutex as a recursive mutex
pthread_mutexattr_t Attr;
int errorcode = pthread_mutexattr_init(&Attr);
assert(errorcode == 0);
errorcode = pthread_mutexattr_settype(&Attr, PTHREAD_MUTEX_RECURSIVE);
assert(errorcode == 0);
errorcode = pthread_mutex_init(&mutex, &Attr);
assert(errorcode == 0);
errorcode = pthread_mutexattr_destroy(&Attr);
assert(errorcode == 0);
}
~Mutex() {
int errorcode = pthread_mutex_destroy(&mutex);
assert(errorcode == 0);
}
void acquire () {
int errorcode = pthread_mutex_lock(&mutex);
assert(errorcode == 0);
}
void release () {
int errorcode = pthread_mutex_unlock(&mutex);
assert(errorcode == 0);
}
};
} // end namespace llvm
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