/*
* nonportable.c
*
* Description:
* This translation unit implements non-portable 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"
/*
* pthread_mutexattr_setforcecs_np()
*
* Allows an application to force the library to use
* critical sections rather than win32 mutexes as
* the basis for any mutexes that use "attr".
*
* Values for "forcecs" are defined in pthread.h
*/
int
pthread_mutexattr_setforcecs_np(pthread_mutexattr_t *attr,
int forcecs)
{
if (attr == NULL || *attr == NULL)
{
/* This is disallowed. */
return EINVAL;
}
(*attr)->forcecs = forcecs;
return 0;
}
/*
* pthread_getw32threadhandle_np()
*
* Returns the win32 thread handle that the POSIX
* thread "thread" is running as.
*
* Applications can use the win32 handle to set
* win32 specific attributes of the thread.
*/
HANDLE
pthread_getw32threadhandle_np(pthread_t thread)
{
return (thread != NULL) ? (thread->threadH) : 0;
}
/*
* Provide pthread_delay_np posix function for NT
*
* DESCRIPTION
*
* This routine causes a thread to delay execution for a specific period of time.
* This period ends at the current time plus the specified interval. The routine
* will not return before the end of the period is reached, but may return an
* arbitrary amount of time after the period has gone by. This can be due to
* system load, thread priorities, and system timer granularity.
*
* Specifying an interval of zero (0) seconds and zero (0) nanoseconds is
* allowed and can be used to force the thread to give up the processor or to
* deliver a pending cancelation request.
*
* The timespec structure contains the following two fields:
*
* tv_sec is an integer number of seconds.
* tv_nsec is an integer number of nanoseconds.
*
* Return Values
*
* If an error condition occurs, this routine returns an integer value indicating
* the type of error. Possible return values are as follows:
*
* 0
* Successful completion.
* [EINVAL]
* The value specified by interval is invalid.
*
* Example
*
* The following code segment would wait for 5 and 1/2 seconds
*
* struct timespec tsWait;
* int intRC;
*
* tsWait.tv_sec = 5;
* tsWait.tv_nsec = 500000000L;
* intRC = pthread_delay_np(&tsWait);
*/
int
pthread_delay_np (struct timespec * interval)
{
DWORD wait_time, secs_in_millisecs, millisecs;
/*
* We are a cancelation point.
*/
pthread_testcancel();
if (interval->tv_sec < 0 || interval->tv_nsec < 0)
{
return (EINVAL);
}
secs_in_millisecs = interval->tv_sec * 1000L; /* convert secs to millisecs */
/*
* Pedantically, we're ensuring that we don't return before the time is up,
* even by a fraction of a millisecond.
*/
millisecs = (interval->tv_nsec + 999999L) / 1000000L; /* convert nanosecs to millisecs */
wait_time = secs_in_millisecs + millisecs;
Sleep(wait_time);
pthread_testcancel();
return (0);
}
/*
* Handle to kernel32.dll
*/
static HINSTANCE ptw32_h_kernel32;
BOOL
pthread_win32_process_attach_np ()
{
BOOL result = TRUE;
/*
* We use this to double-check that TryEnterCriticalSection works.
*/
CRITICAL_SECTION cs;
result = ptw32_processInitialize ();
/*
* Load KERNEL32 and try to get address of TryEnterCriticalSection
*/
ptw32_h_kernel32 = LoadLibrary(TEXT("KERNEL32.DLL"));
ptw32_try_enter_critical_section = (BOOL (PT_STDCALL *)(LPCRITICAL_SECTION))
#if defined(NEED_UNICODE_CONSTS)
GetProcAddress(ptw32_h_kernel32,
(const TCHAR *)TEXT("TryEnterCriticalSection"));
#else
GetProcAddress(ptw32_h_kernel32,
(LPCSTR) "TryEnterCriticalSection");
#endif
if (ptw32_try_enter_critical_section != NULL)
{
InitializeCriticalSection(&cs);
if ((*ptw32_try_enter_critical_section)(&cs))
{
LeaveCriticalSection(&cs);
}
else
{
/*
* Not really supported (Win98?).
*/
ptw32_try_enter_critical_section = NULL;
}
DeleteCriticalSection(&cs);
}
if (ptw32_try_enter_critical_section == NULL)
{
/*
* If TryEnterCriticalSection is not being used, then free
* the kernel32.dll handle now, rather than leaving it until
* DLL_PROCESS_DETACH.
*
* Note: this is not a pedantic exercise in freeing unused
* resources! It is a work-around for a bug in Windows 95
* (see microsoft knowledge base article, Q187684) which
* does Bad Things when FreeLibrary is called within
* the DLL_PROCESS_DETACH code, in certain situations.
* Since w95 just happens to be a platform which does not
* provide TryEnterCriticalSection, the bug will be
* effortlessly avoided.
*/
(void) FreeLibrary(ptw32_h_kernel32);
ptw32_h_kernel32 = 0;
}
return result;
}
BOOL
pthread_win32_process_detach_np ()
{
if (ptw32_processInitialized)
{
pthread_t self = (pthread_t) pthread_getspecific (ptw32_selfThreadKey);
/*
* Detached threads have their resources automatically
* cleaned up upon exit (others must be 'joined').
*/
if (self != NULL &&
self->detachState == PTHREAD_CREATE_DETACHED)
{
pthread_setspecific (ptw32_selfThreadKey, NULL);
ptw32_threadDestroy (self);
}
/*
* The DLL is being unmapped into the process's address space
*/
ptw32_processTerminate ();
if (ptw32_h_kernel32)
{
(void) FreeLibrary(ptw32_h_kernel32);
}
}
return TRUE;
}
BOOL
pthread_win32_thread_attach_np ()
{
return TRUE;
}
BOOL
pthread_win32_thread_detach_np ()
{
if (ptw32_processInitialized)
{
pthread_t self = (pthread_t) pthread_getspecific (ptw32_selfThreadKey);
/*
* Detached threads have their resources automatically
* cleaned up upon exit (others must be 'joined').
*/
if (self != NULL &&
self->detachState == PTHREAD_CREATE_DETACHED)
{
pthread_setspecific (ptw32_selfThreadKey, NULL);
ptw32_threadDestroy (self);
}
}
return TRUE;
}