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- Tue Aug 17 21:36:08 1999 Mumit Khan <khan@xraylith.wisc.edu>
-
- * gthr-win32.h: New file.
-
- Index: gcc-2.95.2/gcc/gthr-win32.h
- ===================================================================
- RCS file: gthr-win32.h
- diff -N gthr-win32.h
- --- /dev/null Tue May 5 15:32:27 1998
- +++ gcc-2.95.2/gcc/gthr-win32.h Fri Nov 5 02:25:50 1999
- @@ -0,0 +1,195 @@
- +/* Threads compatibily routines for libgcc2. */
- +/* Compile this one with gcc. */
- +/* Copyright (C) 1999 Free Software Foundation, Inc.
- + Contributed by Mumit Khan <khan@xraylith.wisc.edu>.
- +
- +This file is part of GNU CC.
- +
- +GNU CC is free software; you can redistribute it and/or modify
- +it under the terms of the GNU General Public License as published by
- +the Free Software Foundation; either version 2, or (at your option)
- +any later version.
- +
- +GNU CC 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 General Public License for more details.
- +
- +You should have received a copy of the GNU General Public License
- +along with GNU CC; see the file COPYING. If not, write to
- +the Free Software Foundation, 59 Temple Place - Suite 330,
- +Boston, MA 02111-1307, USA. */
- +
- +/* As a special exception, if you link this library with other files,
- + some of which are compiled with GCC, to produce an executable,
- + this library does not by itself cause the resulting executable
- + to be covered by the GNU General Public License.
- + This exception does not however invalidate any other reasons why
- + the executable file might be covered by the GNU General Public License. */
- +
- +#ifndef __gthr_win32_h
- +#define __gthr_win32_h
- +
- +/* Windows32 threads specific definitions. The windows32 threading model
- + does not map well into pthread-inspired gcc's threading model, and so
- + there are caveats one needs to be aware of.
- +
- + 1. The destructor supplied to __gthread_key_create is ignored. This
- + will certainly cause memory leaks due to unreclaimed eh contexts
- + (sizeof (eh_context) is at least 24 bytes for x86 currently).
- +
- + This memory leak may be significant for long-running applications
- + that make heavy use of C++ EH.
- +
- + 2. The error codes returned are non-POSIX like, and cast into ints.
- + This may cause incorrect error return due to truncation values on
- + hw where sizeof (DWORD) > sizeof (int).
- +
- + The basic framework should work well enough. */
- +
- +#define __GTHREADS 1
- +
- +#include <windows.h>
- +#include <errno.h>
- +
- +typedef DWORD __gthread_key_t;
- +
- +typedef struct {
- + int done;
- + long started;
- +} __gthread_once_t;
- +
- +typedef HANDLE __gthread_mutex_t;
- +
- +#define __GTHREAD_ONCE_INIT {FALSE, -1}
- +#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
- +
- +static inline int
- +__gthread_active_p ()
- +{
- + return 1;
- +}
- +
- +static inline int
- +__gthread_once (__gthread_once_t *once, void (*func) ())
- +{
- + if (! __gthread_active_p ())
- + return -1;
- + else if (once == NULL || func == NULL)
- + return EINVAL;
- +
- + if (! once->done)
- + {
- + if (InterlockedIncrement (&(once->started)) == 0)
- + {
- + (*func) ();
- + once->done = TRUE;
- + }
- + }
- + else
- + {
- + /* Another thread is currently executing the code, so wait for it to
- + finish; yield the CPU in the meantime. */
- + while (! once->done)
- + Sleep (0);
- + }
- +
- + return 0;
- +}
- +
- +/* Windows32 thread local keys don't support destructors; to avoid leaks,
- + we will have to figure something out in the future. */
- +static inline int
- +__gthread_key_create (__gthread_key_t *key,
- + void (*dtor) (void *) __attribute__((__unused__)))
- +{
- + int status = 0;
- + DWORD tls_index = TlsAlloc ();
- + if (tls_index != 0xFFFFFFFF)
- + *key = tls_index;
- + else
- + status = (int) GetLastError ();
- + return status;
- +}
- +
- +/* Currently, this routine is never called since win32 keys don't support
- + destructors. Hopefully we'll find a way in the future. */
- +static inline int
- +__gthread_key_dtor (__gthread_key_t key, void *ptr)
- +{
- + int status = 0;
- +
- + /* Just reset the key value to zero. */
- + if (ptr)
- + status = (TlsSetValue (key, 0) != 0) ? 0 : (int) GetLastError ();
- + return status;
- +}
- +
- +/* Currently, this routine is never called since win32 keys don't support
- + destructors. Hopefully we'll find a way in the future. */
- +static inline int
- +__gthread_key_delete (__gthread_key_t key)
- +{
- + return (TlsFree (key) != 0) ? 0 : (int) GetLastError ();
- +}
- +
- +static inline void *
- +__gthread_getspecific (__gthread_key_t key)
- +{
- + return TlsGetValue (key);
- +}
- +
- +static inline int
- +__gthread_setspecific (__gthread_key_t key, const void *ptr)
- +{
- + return (TlsSetValue (key, ptr) != 0) ? 0 : (int) GetLastError ();
- +}
- +
- +static inline void
- +__gthread_mutex_init_function (__gthread_mutex_t *mutex)
- +{
- + /* Create unnamed mutex with default security attr and no initial owner. */
- + *mutex = CreateMutex (NULL, 0, NULL);
- +}
- +
- +static inline int
- +__gthread_mutex_lock (__gthread_mutex_t *mutex)
- +{
- + int status = 0;
- +
- + if (__gthread_active_p ())
- + {
- + if (WaitForSingleObject (*mutex, INFINITE) == WAIT_OBJECT_0)
- + status = 0;
- + else
- + status = 1;
- + }
- + return status;
- +}
- +
- +static inline int
- +__gthread_mutex_trylock (__gthread_mutex_t *mutex)
- +{
- + int status = 0;
- +
- + if (__gthread_active_p ())
- + {
- + if (WaitForSingleObject (*mutex, 0) == WAIT_OBJECT_0)
- + status = 0;
- + else
- + status = 1;
- + }
- + return status;
- +}
- +
- +static inline int
- +__gthread_mutex_unlock (__gthread_mutex_t *mutex)
- +{
- + if (__gthread_active_p ())
- + return (ReleaseMutex (*mutex) != 0) ? 0 : 1;
- + else
- + return 0;
- +}
- +
- +#endif /* not __gthr_win32_h */
- +
-