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/*
* Licensed under CLIFE license. See LICENCE.TXT
*
* Produced by: Jeff Lait
*
* CLIFE Development
*
* NAME: thread.cpp ( CLIFE, C++ )
*
* COMMENTS:
* Attempt at a threading class.
*/
#include "thread.h"
#ifdef LINUX
#include "thread_linux.h"
#ifndef iPOWDER
#include <sys/sysinfo.h>
#endif
#else
#include "thread_win.h"
#endif
THREAD *
THREAD::alloc()
{
#ifdef LINUX
return new THREAD_LINUX();
#else
return new THREAD_WIN();
#endif
}
int
THREAD::numProcessors()
{
static int nproc = -1;
if (nproc < 0)
{
#ifdef LINUX
#ifdef iPOWDER
nproc = 1;
#else
nproc = get_nprocs_conf();
#endif
#else
SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
nproc = sysinfo.dwNumberOfProcessors;
#endif
// Zany users have managed to muck with thier registery to
// get 0 procs returned...
if (nproc < 1)
nproc = 1;
}
return nproc;
}
void *
THREAD::wrapper(void *data)
{
THREAD *thread = (THREAD *) data;
while (1)
{
// Await the thread to be ready.
thread->waittillimready();
thread->setActive(true);
// Hurray! Trigger callback.
if (thread->myCB)
thread->myCB(thread->myCBData);
thread->iamdonenow();
thread->setActive(false);
}
return (void *)1;
}
LOCK::LOCK()
{
#ifdef LINUX
pthread_mutexattr_init(&myLockAttr);
#ifdef iPOWDER
pthread_mutexattr_settype(&myLockAttr, PTHREAD_MUTEX_RECURSIVE);
#else
pthread_mutexattr_settype(&myLockAttr, PTHREAD_MUTEX_RECURSIVE_NP);
#endif
pthread_mutex_init(&myLock, &myLockAttr);
#else
myLock = new CRITICAL_SECTION;
::InitializeCriticalSection(myLock);
#endif
}
LOCK::~LOCK()
{
#ifdef LINUX
pthread_mutex_destroy(&myLock);
pthread_mutexattr_destroy(&myLockAttr);
#else
DeleteCriticalSection(myLock);
delete myLock;
#endif
}
bool
LOCK::tryToLock()
{
#ifdef LINUX
return !pthread_mutex_trylock(&myLock);
#else
return ::TryEnterCriticalSection(myLock) ? true : false;
#endif
}
void
LOCK::lock()
{
#ifdef LINUX
pthread_mutex_lock(&myLock);
#else
::EnterCriticalSection(myLock);
#endif
}
void
LOCK::unlock()
{
#ifdef LINUX
pthread_mutex_unlock(&myLock);
#else
::LeaveCriticalSection(myLock);
#endif
}
bool
LOCK::isLocked()
{
if (tryToLock())
{
unlock();
return false;
}
return true;
}
CONDITION::CONDITION()
{
#ifdef LINUX
pthread_cond_init(&myCond, 0);
#else
myEvent = CreateEvent(0, false, false, 0);
myNumWaiting.set(0);
#endif
}
CONDITION::~CONDITION()
{
#ifdef LINUX
pthread_cond_destroy(&myCond);
#else
CloseHandle(myEvent);
#endif
}
void
CONDITION::wait(LOCK &lock)
{
#ifdef LINUX
pthread_cond_wait(&myCond, &lock.myLock);
#else
myNumWaiting.add(1);
lock.unlock();
WaitForSingleObject(myEvent, INFINITE);
myNumWaiting.add(-1);
lock.lock();
#endif
}
void
CONDITION::trigger()
{
#ifdef LINUX
pthread_cond_signal(&myCond);
#else
// This requires the caller has the lock active so no one
// will start a wait during our test.
if (myNumWaiting > 0)
SetEvent(myEvent);
#endif
}
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