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misc.c    365 lines (311 with data), 8.9 kB

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/*
* misc.c
*
* Description:
* This translation unit implements miscellaneous thread functions.
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright (C) 1998
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
int
pthread_once (
pthread_once_t * once_control,
void (*init_routine) (void)
)
/*
* ------------------------------------------------------
* DOCPUBLIC
* If any thread in a process with a once_control parameter
* makes a call to pthread_once(), the first call will summon
* the init_routine(), but subsequent calls will not. The
* once_control parameter determines whether the associated
* initialization routine has been called. The init_routine()
* is complete upon return of pthread_once().
* This function guarantees that one and only one thread
* executes the initialization routine, init_routine when
* access is controlled by the pthread_once_t control
* key.
*
* PARAMETERS
* once_control
* pointer to an instance of pthread_once_t
*
* init_routine
* pointer to an initialization routine
*
*
* DESCRIPTION
* See above.
*
* RESULTS
* 0 success,
* EINVAL once_control or init_routine is NULL
*
* ------------------------------------------------------
*/
{
int result;
if (once_control == NULL || init_routine == NULL)
{
result = EINVAL;
goto FAIL0;
}
else
{
result = 0;
}
if (!once_control->done)
{
if (InterlockedIncrement (&(once_control->started)) == 0)
{
/*
* First thread to increment the started variable
*/
(*init_routine) ();
once_control->done = TRUE;
}
else
{
/*
* Block until other thread finishes executing the onceRoutine
*/
while (!(once_control->done))
{
/*
* The following gives up CPU cycles without pausing
* unnecessarily
*/
Sleep (0);
}
}
}
/*
* Fall through Intentionally
*/
/*
* ------------
* Failure Code
* ------------
*/
FAIL0:
return (result);
} /* pthread_once */
pthread_t
pthread_self (void)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function returns a reference to the current running
* thread.
*
* PARAMETERS
* N/A
*
*
* DESCRIPTION
* This function returns a reference to the current running
* thread.
*
* RESULTS
* pthread_t reference to the current thread
*
* ------------------------------------------------------
*/
{
pthread_t self = NULL;
/*
* need to ensure there always is a self
*/
if ((self = (pthread_t) pthread_getspecific (_pthread_selfThreadKey))
== NULL)
{
/*
* Need to create an implicit 'self' for the currently
* executing thread.
*/
self = (pthread_t) calloc (1, sizeof (*self));
if (self != NULL)
{
self->implicit = 1;
self->detachState = PTHREAD_CREATE_DETACHED;
self->thread = GetCurrentThreadId ();
if( !DuplicateHandle(
GetCurrentProcess(),
GetCurrentThread(),
GetCurrentProcess(),
&self->threadH,
0,
FALSE,
DUPLICATE_SAME_ACCESS ) )
{
free( self );
return (NULL);
}
}
pthread_setspecific (_pthread_selfThreadKey, self);
}
return (self);
} /* pthread_self */
int
pthread_equal (pthread_t t1, pthread_t t2)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function returns zero if t1 and t2 are equal, else
* returns nonzero
*
* PARAMETERS
* t1,
* t2
* references to an instances of thread_t
*
*
* DESCRIPTION
* This function returns nonzero if t1 and t2 are equal, else
* returns zero.
*
* RESULTS
* non-zero if t1 and t2 refer to the same thread,
* 0 t1 and t2 do not refer to the same thread
*
* ------------------------------------------------------
*/
{
int result;
result = ((t1 == t2) && (t1->thread == t2->thread));
return (result);
} /* pthread_equal */
static int
CancelableWait (HANDLE waitHandle, DWORD timeout)
/*
* -------------------------------------------------------------------
* This provides an extra hook into the pthread_cancel
* mechanism that will allow you to wait on a Windows handle and make it a
* cancellation point. This function blocks until the given WIN32 handle is
* signaled or pthread_cancel has been called. It is implemented using
* WaitForMultipleObjects on 'waitHandle' and a manually reset WIN32
* event used to implement pthread_cancel.
*
* Given this hook it would be possible to implement more of the cancellation
* points.
* -------------------------------------------------------------------
*/
{
int result;
pthread_t self;
HANDLE handles[2];
DWORD nHandles = 1;
DWORD status;
handles[0] = waitHandle;
if ((self = (pthread_t) pthread_getspecific (_pthread_selfThreadKey))
!= NULL)
{
/*
* Get cancelEvent handle
*/
if (self->cancelState == PTHREAD_CANCEL_ENABLE)
{
if ((handles[1] = self->cancelEvent) != NULL)
{
nHandles++;
}
}
}
else
{
handles[1] = NULL;
}
status = WaitForMultipleObjects (
nHandles,
handles,
FALSE,
timeout);
if (status == WAIT_FAILED)
{
result = EINVAL;
}
else if (status == WAIT_TIMEOUT)
{
result = ETIMEDOUT;
}
else if (status == WAIT_ABANDONED_0)
{
result = EINVAL;
}
else
{
/*
* Either got the mutex or the cancel event
* was signaled
*/
switch (status - WAIT_OBJECT_0)
{
case 0:
/*
* Got the mutex
*/
result = 0;
break;
case 1:
/*
* Got cancel request
*/
ResetEvent (handles[1]);
if (self != NULL && !self->implicit)
{
/*
* Thread started with pthread_create
*/
#ifdef _MSC_VER
DWORD exceptionInformation[3];
exceptionInformation[0] = (DWORD) (_PTHREAD_EPS_CANCEL);
exceptionInformation[1] = (DWORD) (0);
exceptionInformation[2] = (DWORD) (0);
RaiseException (
EXCEPTION_PTHREAD_SERVICES,
0,
3,
exceptionInformation);
#else /* _MSC_VER */
#ifdef __cplusplus
throw Pthread_exception_cancel();
#endif /* __cplusplus */
#endif /* _MSC_VER */
}
/* Should never get to here. */
result = EINVAL;
break;
default:
result = EINVAL;
break;
}
}
return (result);
} /* pthreadCancelableWait */
int
pthreadCancelableWait (HANDLE waitHandle)
{
return (CancelableWait(waitHandle, INFINITE));
}
int
pthreadCancelableTimedWait (HANDLE waitHandle, DWORD timeout)
{
return (CancelableWait(waitHandle, timeout));
}