121 lines
2.6 KiB
C++
121 lines
2.6 KiB
C++
#include <pthread.h>
|
|
#include <iostream>
|
|
#include <errno.h>
|
|
|
|
namespace cgv {
|
|
namespace os {
|
|
|
|
unsigned& ref_debug_lock_counter()
|
|
{
|
|
static unsigned counter = 0;
|
|
return counter;
|
|
}
|
|
|
|
mutex& ref_debug_mutex()
|
|
{
|
|
static mutex m;
|
|
return m;
|
|
}
|
|
|
|
/// return the global locking counter that is used for mutex debugging
|
|
unsigned mutex::get_debug_lock_counter()
|
|
{
|
|
return ref_debug_lock_counter();
|
|
}
|
|
|
|
///construct a mutex
|
|
mutex::mutex()
|
|
{
|
|
pthread_mutex_init (&(pthread_mutex_t&)pmutex, NULL);
|
|
}
|
|
|
|
///destruct a mutex
|
|
mutex::~mutex()
|
|
{
|
|
pthread_mutex_destroy (&(pthread_mutex_t&)pmutex);
|
|
}
|
|
|
|
///lock the mutex (if the mutex is still locked, the caller is blocked until the
|
|
///mutex becomes available)
|
|
void mutex::lock()
|
|
{
|
|
pthread_mutex_lock (&(pthread_mutex_t&)pmutex);
|
|
}
|
|
|
|
///unlock the mutex
|
|
void mutex::unlock()
|
|
{
|
|
pthread_mutex_unlock (&(pthread_mutex_t&)pmutex);
|
|
}
|
|
|
|
/// same as lock but with printing debug information
|
|
void mutex::debug_lock(const std::string& info)
|
|
{
|
|
ref_debug_mutex().lock();
|
|
std::cout << info << ": wait for lock [" << this << ":" << get_debug_lock_counter() << "]" << std::endl;
|
|
++ref_debug_lock_counter();
|
|
ref_debug_mutex().unlock();
|
|
lock();
|
|
ref_debug_mutex().lock();
|
|
std::cout << info << ": received lock [" << this << "]" << std::endl;
|
|
ref_debug_mutex().unlock();
|
|
}
|
|
/// same unlock but with printing debug information
|
|
void mutex::debug_unlock(const std::string& info)
|
|
{
|
|
unlock();
|
|
ref_debug_mutex().lock();
|
|
std::cout << info << ": unlock [" << this << "]" << std::endl;
|
|
ref_debug_mutex().unlock();
|
|
}
|
|
|
|
|
|
///try to lock the mutex (return false if the mutex is still locked)
|
|
bool mutex::try_lock()
|
|
{
|
|
return pthread_mutex_trylock(&(pthread_mutex_t&)pmutex) != EBUSY;
|
|
}
|
|
|
|
///construct a mutex
|
|
condition_mutex::condition_mutex()
|
|
{
|
|
pthread_cond_init(&(pthread_cond_t&)pcond, NULL);
|
|
}
|
|
|
|
///destruct a mutex
|
|
condition_mutex::~condition_mutex()
|
|
{
|
|
pthread_cond_destroy(&(pthread_cond_t&)pcond);
|
|
}
|
|
|
|
/// send the signal to unblock a thread waiting for the condition represented by this condition_mutex
|
|
void condition_mutex::send_signal()
|
|
{
|
|
pthread_cond_signal(&(pthread_cond_t&)pcond);
|
|
}
|
|
|
|
/// prefered approach to send the signal and implemented as {lock();send_signal();unlock();}
|
|
void condition_mutex::send_signal_with_lock()
|
|
{
|
|
lock();
|
|
send_signal();
|
|
unlock();
|
|
}
|
|
|
|
/// broadcast signal to unblock several threads waiting for the condition represented by this condition_mutex
|
|
void condition_mutex::broadcast_signal()
|
|
{
|
|
pthread_cond_broadcast(&(pthread_cond_t&)pcond);
|
|
}
|
|
|
|
/// prefered approach to broadcast the signal and implemented as {lock();broadcast_signal();unlock();}
|
|
void condition_mutex::broadcast_signal_with_lock()
|
|
{
|
|
lock();
|
|
broadcast_signal();
|
|
unlock();
|
|
}
|
|
|
|
}
|
|
}
|
|
|