Gcc 3.1.0 pre-release from the FSF anoncvs repo on 9-May-2002 15:57:15 EDT.

1 files changed, 509 insertions, 0 deletions

diff --git a/contrib/gcc/gthr-win32.h b/contrib/gcc/gthr-win32.h
new file mode 100644
index 0000000..97d5a82
--- /dev/null
+++ b/contrib/gcc/gthr-win32.h
@@ -0,0 +1,509 @@
+/* Threads compatibility routines for libgcc2 and libobjc.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc.
+   Contributed by Mumit Khan <khan@xraylith.wisc.edu>.
+
+This file is part of GCC.
+
+GCC 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.
+
+GCC 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 GCC; 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 GCC_GTHR_WIN32_H
+#define GCC_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 for
+      generic x86-win32 ports. 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.
+
+      However, Mingw runtime (version 0.3 or newer) provides a mechanism
+      to emulate pthreads key dtors; the runtime provides a special DLL,
+      linked in if -mthreads option is specified, that runs the dtors in
+      the reverse order of registration when each thread exits. If
+      -mthreads option is not given, a stub is linked in instead of the
+      DLL, which results in memory leak. Other x86-win32 ports can use 
+      the same technique of course to avoid the leak.
+
+   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).
+   
+   3. We might consider using Critical Sections instead of Windows32 
+      mutexes for better performance, but emulating __gthread_mutex_trylock 
+      interface becomes more complicated (Win9x does not support
+      TryEnterCriticalSectioni, while NT does).
+  
+   The basic framework should work well enough. In the long term, GCC
+   needs to use Structured Exception Handling on Windows32.  */
+
+#define __GTHREADS 1
+
+#include <errno.h>
+#ifdef __MINGW32__
+#include <_mingw.h>
+#endif
+
+#ifdef _LIBOBJC
+
+/* This is necessary to prevent windef.h (included from windows.h) from
+   defining it's own BOOL as a typedef.  */	
+#ifndef __OBJC__
+#define __OBJC__
+#endif
+#include <windows.h>
+/* Now undef the windows BOOL.  */ 
+#undef BOOL
+
+/* Key structure for maintaining thread specific storage */
+static DWORD	__gthread_objc_data_tls = (DWORD)-1;
+
+/* Backend initialization functions */
+
+/* Initialize the threads subsystem.  */
+int
+__gthread_objc_init_thread_system(void)
+{
+  /* Initialize the thread storage key */
+  if ((__gthread_objc_data_tls = TlsAlloc()) != (DWORD)-1)
+    return 0;
+  else
+    return -1;
+}
+
+/* Close the threads subsystem.  */
+int
+__gthread_objc_close_thread_system(void)
+{
+  if (__gthread_objc_data_tls != (DWORD)-1)
+    TlsFree(__gthread_objc_data_tls);
+  return 0;
+}
+
+/* Backend thread functions */
+
+/* Create a new thread of execution.  */
+objc_thread_t
+__gthread_objc_thread_detach(void (*func)(void *arg), void *arg)
+{
+  DWORD	thread_id = 0;
+  HANDLE win32_handle;
+
+  if (!(win32_handle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)func,
+                                   arg, 0, &thread_id)))
+    thread_id = 0;
+  
+  return (objc_thread_t)thread_id;
+}
+
+/* Set the current thread's priority.  */
+int
+__gthread_objc_thread_set_priority(int priority)
+{
+  int sys_priority = 0;
+
+  switch (priority)
+    {
+    case OBJC_THREAD_INTERACTIVE_PRIORITY:
+      sys_priority = THREAD_PRIORITY_NORMAL;
+      break;
+    default:
+    case OBJC_THREAD_BACKGROUND_PRIORITY:
+      sys_priority = THREAD_PRIORITY_BELOW_NORMAL;
+      break;
+    case OBJC_THREAD_LOW_PRIORITY:
+      sys_priority = THREAD_PRIORITY_LOWEST;
+      break;
+    }
+
+  /* Change priority */
+  if (SetThreadPriority(GetCurrentThread(), sys_priority))
+    return 0;
+  else
+    return -1;
+}
+
+/* Return the current thread's priority.  */
+int
+__gthread_objc_thread_get_priority(void)
+{
+  int sys_priority;
+
+  sys_priority = GetThreadPriority(GetCurrentThread());
+  
+  switch (sys_priority)
+    {
+    case THREAD_PRIORITY_HIGHEST:
+    case THREAD_PRIORITY_TIME_CRITICAL:
+    case THREAD_PRIORITY_ABOVE_NORMAL:
+    case THREAD_PRIORITY_NORMAL:
+      return OBJC_THREAD_INTERACTIVE_PRIORITY;
+
+    default:
+    case THREAD_PRIORITY_BELOW_NORMAL:
+      return OBJC_THREAD_BACKGROUND_PRIORITY;
+    
+    case THREAD_PRIORITY_IDLE:
+    case THREAD_PRIORITY_LOWEST:
+      return OBJC_THREAD_LOW_PRIORITY;
+    }
+
+  /* Couldn't get priority.  */
+  return -1;
+}
+
+/* Yield our process time to another thread.  */
+void
+__gthread_objc_thread_yield(void)
+{
+  Sleep(0);
+}
+
+/* Terminate the current thread.  */
+int
+__gthread_objc_thread_exit(void)
+{
+  /* exit the thread */
+  ExitThread(__objc_thread_exit_status);
+
+  /* Failed if we reached here */
+  return -1;
+}
+
+/* Returns an integer value which uniquely describes a thread.  */
+objc_thread_t
+__gthread_objc_thread_id(void)
+{
+  return (objc_thread_t)GetCurrentThreadId();
+}
+
+/* Sets the thread's local storage pointer.  */
+int
+__gthread_objc_thread_set_data(void *value)
+{
+  if (TlsSetValue(__gthread_objc_data_tls, value))
+    return 0;
+  else
+    return -1;
+}
+
+/* Returns the thread's local storage pointer.  */
+void *
+__gthread_objc_thread_get_data(void)
+{
+  DWORD lasterror;
+  void *ptr;
+
+  lasterror = GetLastError();
+
+  ptr = TlsGetValue(__gthread_objc_data_tls);          /* Return thread data.  */
+
+  SetLastError( lasterror );
+
+  return ptr;
+}
+
+/* Backend mutex functions */
+
+/* Allocate a mutex.  */
+int
+__gthread_objc_mutex_allocate(objc_mutex_t mutex)
+{
+  if ((mutex->backend = (void *)CreateMutex(NULL, 0, NULL)) == NULL)
+    return -1;
+  else
+    return 0;
+}
+
+/* Deallocate a mutex.  */
+int
+__gthread_objc_mutex_deallocate(objc_mutex_t mutex)
+{
+  CloseHandle((HANDLE)(mutex->backend));
+  return 0;
+}
+
+/* Grab a lock on a mutex.  */
+int
+__gthread_objc_mutex_lock(objc_mutex_t mutex)
+{
+  int status;
+
+  status = WaitForSingleObject((HANDLE)(mutex->backend), INFINITE);
+  if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
+    return -1;
+  else
+    return 0;
+}
+
+/* Try to grab a lock on a mutex.  */
+int
+__gthread_objc_mutex_trylock(objc_mutex_t mutex)
+{
+  int status;
+
+  status = WaitForSingleObject((HANDLE)(mutex->backend), 0);
+  if (status != WAIT_OBJECT_0 && status != WAIT_ABANDONED)
+    return -1;
+  else
+    return 0;
+}
+
+/* Unlock the mutex */
+int
+__gthread_objc_mutex_unlock(objc_mutex_t mutex)
+{
+  if (ReleaseMutex((HANDLE)(mutex->backend)) == 0)
+    return -1;
+  else
+    return 0;
+}
+
+/* Backend condition mutex functions */
+
+/* Allocate a condition.  */
+int
+__gthread_objc_condition_allocate(objc_condition_t condition)
+{
+  /* Unimplemented.  */
+  return -1;
+}
+
+/* Deallocate a condition.  */
+int
+__gthread_objc_condition_deallocate(objc_condition_t condition)
+{
+  /* Unimplemented.  */
+  return -1;
+}
+
+/* Wait on the condition */
+int
+__gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
+{
+  /* Unimplemented.  */
+  return -1;
+}
+
+/* Wake up all threads waiting on this condition.  */
+int
+__gthread_objc_condition_broadcast(objc_condition_t condition)
+{
+  /* Unimplemented.  */
+  return -1;
+}
+
+/* Wake up one thread waiting on this condition.  */
+int
+__gthread_objc_condition_signal(objc_condition_t condition)
+{
+  /* Unimplemented.  */
+  return -1;
+}
+
+#else /* _LIBOBJC */
+
+#include <windows.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
+
+#if __MINGW32_MAJOR_VERSION >= 1 || \
+  (__MINGW32_MAJOR_VERSION == 0 && __MINGW32_MINOR_VERSION > 2)
+#define MINGW32_SUPPORTS_MT_EH 1
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern int __mingwthr_key_dtor (DWORD, void (*) (void *));
+#ifdef __cplusplus
+}
+#endif
+
+/* Mingw runtime >= v0.3 provides a magic variable that is set to non-zero
+   if -mthreads option was specified, or 0 otherwise. This is to get around 
+   the lack of weak symbols in PE-COFF.  */
+extern int _CRT_MT;
+#endif
+
+static inline int
+__gthread_active_p (void)
+{
+#ifdef MINGW32_SUPPORTS_MT_EH
+  return _CRT_MT;
+#else
+  return 1;
+#endif
+}
+
+static inline int
+__gthread_once (__gthread_once_t *once, void (*func) (void))
+{
+  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.  If performance 
+	     does become an issue, the solution is to use an Event that 
+	     we wait on here (and set above), but that implies a place to 
+	     create the event before this routine is called.  */ 
+	  while (! once->done)
+	    Sleep (0);
+	}
+    }
+  
+  return 0;
+}
+
+/* Windows32 thread local keys don't support destructors; this leads to
+   leaks, especially in threaded applications making extensive use of 
+   C++ EH. Mingw uses a thread-support DLL to work-around this problem.  */
+static inline int
+__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
+{
+  int status = 0;
+  DWORD tls_index = TlsAlloc ();
+  if (tls_index != 0xFFFFFFFF)
+    {
+      *key = tls_index;
+#ifdef MINGW32_SUPPORTS_MT_EH
+      /* Mingw runtime will run the dtors in reverse order for each thread
+         when the thread exits.  */
+      status = __mingwthr_key_dtor (*key, dtor);
+#endif
+    }
+  else
+    status = (int) GetLastError ();
+  return status;
+}
+
+/* Currently, this routine is called only for Mingw runtime, and if
+   -mthreads option is chosen to link in the thread support DLL.  */ 
+static inline int
+__gthread_key_dtor (__gthread_key_t key, void *ptr)
+{
+  /* Nothing needed.  */
+  return 0;
+}
+
+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)
+{
+  DWORD lasterror;
+  void *ptr;
+
+  lasterror = GetLastError();
+
+  ptr = TlsGetValue(key);
+
+  SetLastError( lasterror );
+
+  return ptr;
+}
+
+static inline int
+__gthread_setspecific (__gthread_key_t key, const void *ptr)
+{
+  return (TlsSetValue (key, (void*) 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 /* _LIBOBJC */
+
+#endif /* ! GCC_GTHR_WIN32_H */
+