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// Copyright (C) 2003 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_THREADS_KERNEl_2_
#define DLIB_THREADS_KERNEl_2_
#ifdef DLIB_ISO_CPP_ONLY
#error "DLIB_ISO_CPP_ONLY is defined so you can't use this OS dependent code. Turn DLIB_ISO_CPP_ONLY off if you want to use it."
#endif
#include "threads_kernel_abstract.h"
#include <pthread.h>
#include <errno.h>
#include <sys/time.h>
#include "../algs.h"
namespace dlib
{
// ----------------------------------------------------------------------------------------
typedef pthread_t thread_id_type;
inline thread_id_type get_thread_id (
)
{
return pthread_self();
}
// ----------------------------------------------------------------------------------------
// ----------------------------------------------------------------------------------------
// mutex object
// ----------------------------------------------------------------------------------------
// ----------------------------------------------------------------------------------------
// forward declaration of signaler
class signaler;
class mutex
{
// give signaler access to hMutex
friend class signaler;
public:
mutex (
)
{
if (pthread_mutex_init(&myMutex,0))
{
throw dlib::thread_error(ECREATE_MUTEX,
"in function mutex::mutex() an error occurred making the mutex"
);
}
}
~mutex (
) { pthread_mutex_destroy(&myMutex); }
void lock (
) const { pthread_mutex_lock(&myMutex); }
void unlock (
) const { pthread_mutex_unlock(&myMutex); }
private:
mutable pthread_mutex_t myMutex;
// restricted functions
mutex(mutex&); // copy constructor
mutex& operator=(mutex&); // assignement opertor
};
// ----------------------------------------------------------------------------------------
// ----------------------------------------------------------------------------------------
// signaler object
// ----------------------------------------------------------------------------------------
// ----------------------------------------------------------------------------------------
class signaler
{
public:
signaler (
const mutex& assoc_mutex
) :
associated_mutex(&assoc_mutex.myMutex),
m(assoc_mutex)
{
if (pthread_cond_init(&cond,0))
{
throw dlib::thread_error(ECREATE_SIGNALER,
"in function signaler::signaler() an error occurred making the signaler"
);
}
}
~signaler (
) { pthread_cond_destroy(&cond); }
void wait (
) const
{
pthread_cond_wait(&cond,associated_mutex);
}
bool wait_or_timeout (
unsigned long milliseconds
) const
{
timespec time_to_wait;
timeval curtime;
gettimeofday(&curtime,0);
// get the time and adjust the timespec object by the appropriate amount
time_to_wait.tv_sec = milliseconds/1000 + curtime.tv_sec;
time_to_wait.tv_nsec = curtime.tv_usec;
time_to_wait.tv_nsec *= 1000;
time_to_wait.tv_nsec += (milliseconds%1000)*1000000;
time_to_wait.tv_sec += time_to_wait.tv_nsec/1000000000;
time_to_wait.tv_nsec = time_to_wait.tv_nsec%1000000000;
if ( pthread_cond_timedwait(&cond,associated_mutex,&time_to_wait) == ETIMEDOUT)
{
return false;
}
else
{
return true;
}
}
void signal (
) const { pthread_cond_signal(&cond); }
void broadcast (
) const { pthread_cond_broadcast(&cond); }
const mutex& get_mutex (
) const { return m; }
private:
pthread_mutex_t* const associated_mutex;
mutable pthread_cond_t cond;
const mutex& m;
// restricted functions
signaler(signaler&); // copy constructor
signaler& operator=(signaler&); // assignement opertor
};
// ----------------------------------------------------------------------------------------
namespace threads_kernel_shared_helpers
{
bool spawn_thread (
void (*funct)(void*),
void* param
);
/*!
is identical to create_new_thread() but just doesn't use any thread pooling.
!*/
}
// ----------------------------------------------------------------------------------------
}
#include "threads_kernel_shared.h"
#ifdef NO_MAKEFILE
#include "threads_kernel_2.cpp"
#endif
#endif // DLIB_THREADS_KERNEl_2_
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