X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fgthr-win32.h;h=4e81598cf868e86ee103be0390dca18999d62726;hb=6a9bcd3e9b7a532cebce25af24999b7e3d8da123;hp=b9402202722cd11fd70226469ebf7bcb96c587ec;hpb=471528fc568e554fb158f18e45b55c38ef755958;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/gthr-win32.h b/gcc/gthr-win32.h index b9402202722..4e81598cf86 100644 --- a/gcc/gthr-win32.h +++ b/gcc/gthr-win32.h @@ -1,24 +1,24 @@ -/* Threads compatibily routines for libgcc2. */ +/* Threads compatibility routines for libgcc2 and libobjc. */ /* Compile this one with gcc. */ -/* Copyright (C) 1999 Free Software Foundation, Inc. +/* Copyright (C) 1999, 2000, 2002, 2003, 2004 Free Software Foundation, Inc. Contributed by Mumit Khan . -This file is part of GNU CC. +This file is part of GCC. -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. +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. -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. +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 GNU CC; see the file COPYING. If not, write to -the Free Software Foundation, 59 Temple Place - Suite 330, -Boston, MA 02111-1307, USA. */ +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, @@ -27,51 +27,507 @@ Boston, MA 02111-1307, USA. */ 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 +#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 + 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). + 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 + This may cause incorrect error return due to truncation values on hw where sizeof (DWORD) > sizeof (int). - - The basic framework should work well enough. */ + + 3. We are currently using a special mutex instead of the Critical + Sections, since Win9x does not support TryEnterCriticalSection + (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 #include +#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 +/* 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; +} -typedef DWORD __gthread_key_t; +/* 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 */ + +#ifdef __cplusplus +extern "C" { +#endif + +typedef unsigned long __gthread_key_t; typedef struct { int done; long started; } __gthread_once_t; -typedef HANDLE __gthread_mutex_t; +typedef struct { + long counter; + void *sema; +} __gthread_mutex_t; + +typedef struct { + long counter; + long depth; + unsigned long owner; + void *sema; +} __gthread_recursive_mutex_t; -#define __GTHREAD_ONCE_INIT {FALSE, -1} +#define __GTHREAD_ONCE_INIT {0, -1} #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function +#define __GTHREAD_MUTEX_INIT_DEFAULT {-1, 0} +#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION \ + __gthread_recursive_mutex_init_function +#define __GTHREAD_RECURSIVE_MUTEX_INIT_DEFAULT {-1, 0, 0, 0} + +#if __MINGW32_MAJOR_VERSION >= 1 || \ + (__MINGW32_MAJOR_VERSION == 0 && __MINGW32_MINOR_VERSION > 2) +#define MINGW32_SUPPORTS_MT_EH 1 +/* Mingw runtime >= v0.3 provides a magic variable that is set to nonzero + 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; +extern int __mingwthr_key_dtor (unsigned long, void (*) (void *)); +#endif /* __MINGW32__ version */ + +/* The Windows95 kernel does not export InterlockedCompareExchange. + This provides a substitute. When building apps that reference + gthread_mutex_try_lock, the __GTHREAD_I486_INLINE_LOCK_PRIMITIVES + macro must be defined if Windows95 is a target. Currently + gthread_mutex_try_lock is not referenced by libgcc or libstdc++. */ +#ifdef __GTHREAD_I486_INLINE_LOCK_PRIMITIVES +static inline long +__gthr_i486_lock_cmp_xchg(long *dest, long xchg, long comperand) +{ + long result; + __asm__ __volatile__ ("\n\ + lock\n\ + cmpxchg{l} {%4, %1|%1, %4}\n" + : "=a" (result), "=m" (*dest) + : "0" (comperand), "m" (*dest), "r" (xchg) + : "cc"); + return result; +} +#define __GTHR_W32_InterlockedCompareExchange __gthr_i486_lock_cmp_xchg +#else /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */ +#define __GTHR_W32_InterlockedCompareExchange InterlockedCompareExchange +#endif /* __GTHREAD_I486_INLINE_LOCK_PRIMITIVES */ static inline int -__gthread_active_p () +__gthread_active_p (void) { +#ifdef MINGW32_SUPPORTS_MT_EH + return _CRT_MT; +#else return 1; +#endif +} + +#if __GTHREAD_HIDE_WIN32API + +/* The implementations are in config/i386/gthr-win32.c in libgcc.a. + Only stubs are exposed to avoid polluting the C++ namespace with + windows api definitions. */ + +extern int __gthr_win32_once (__gthread_once_t *, void (*) (void)); +extern int __gthr_win32_key_create (__gthread_key_t *, void (*) (void*)); +extern int __gthr_win32_key_delete (__gthread_key_t); +extern void * __gthr_win32_getspecific (__gthread_key_t); +extern int __gthr_win32_setspecific (__gthread_key_t, const void *); +extern void __gthr_win32_mutex_init_function (__gthread_mutex_t *); +extern int __gthr_win32_mutex_lock (__gthread_mutex_t *); +extern int __gthr_win32_mutex_trylock (__gthread_mutex_t *); +extern int __gthr_win32_mutex_unlock (__gthread_mutex_t *); +extern void + __gthr_win32_recursive_mutex_init_function (__gthread_recursive_mutex_t *); +extern int __gthr_win32_recursive_mutex_lock (__gthread_recursive_mutex_t *); +extern int + __gthr_win32_recursive_mutex_trylock (__gthread_recursive_mutex_t *); +extern int __gthr_win32_recursive_mutex_unlock (__gthread_recursive_mutex_t *); + +static inline int +__gthread_once (__gthread_once_t *once, void (*func) (void)) +{ + if (__gthread_active_p ()) + return __gthr_win32_once (once, func); + else + return -1; } static inline int -__gthread_once (__gthread_once_t *once, void (*func) ()) +__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *)) +{ + return __gthr_win32_key_create (key, dtor); +} + +static inline int +__gthread_key_delete (__gthread_key_t key) +{ + return __gthr_win32_key_delete (key); +} + +static inline void * +__gthread_getspecific (__gthread_key_t key) +{ + return __gthr_win32_getspecific (key); +} + +static inline int +__gthread_setspecific (__gthread_key_t key, const void *ptr) +{ + return __gthr_win32_setspecific (key, ptr); +} + +static inline void +__gthread_mutex_init_function (__gthread_mutex_t *mutex) +{ + __gthr_win32_mutex_init_function (mutex); +} + +static inline int +__gthread_mutex_lock (__gthread_mutex_t *mutex) +{ + if (__gthread_active_p ()) + return __gthr_win32_mutex_lock (mutex); + else + return 0; +} + +static inline int +__gthread_mutex_trylock (__gthread_mutex_t *mutex) +{ + if (__gthread_active_p ()) + return __gthr_win32_mutex_trylock (mutex); + else + return 0; +} + +static inline int +__gthread_mutex_unlock (__gthread_mutex_t *mutex) +{ + if (__gthread_active_p ()) + return __gthr_win32_mutex_unlock (mutex); + else + return 0; +} + +static inline void +__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex) +{ + __gthr_win32_recursive_mutex_init_function (mutex); +} + +static inline int +__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex) +{ + if (__gthread_active_p ()) + return __gthr_win32_recursive_mutex_lock (mutex); + else + return 0; +} + +static inline int +__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex) +{ + if (__gthread_active_p ()) + return __gthr_win32_recursive_mutex_trylock (mutex); + else + return 0; +} + +static inline int +__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex) +{ + if (__gthread_active_p ()) + return __gthr_win32_recursive_mutex_unlock (mutex); + else + return 0; +} + +#else /* ! __GTHREAD_HIDE_WIN32API */ + +#include +#include + +static inline int +__gthread_once (__gthread_once_t *once, void (*func) (void)) { if (! __gthread_active_p ()) return -1; @@ -81,52 +537,47 @@ __gthread_once (__gthread_once_t *once, void (*func) ()) 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); + } } - 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. */ +/* 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 *) __attribute__((__unused__))) +__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *)) { int status = 0; DWORD tls_index = TlsAlloc (); if (tls_index != 0xFFFFFFFF) - *key = tls_index; + { + *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 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) { @@ -136,20 +587,29 @@ __gthread_key_delete (__gthread_key_t key) static inline void * __gthread_getspecific (__gthread_key_t key) { - return TlsGetValue (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, ptr) != 0) ? 0 : (int) GetLastError (); + 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); + mutex->counter = -1; + mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL); } static inline int @@ -159,10 +619,16 @@ __gthread_mutex_lock (__gthread_mutex_t *mutex) if (__gthread_active_p ()) { - if (WaitForSingleObject (*mutex, INFINITE) == WAIT_OBJECT_0) + if (InterlockedIncrement (&mutex->counter) == 0 || + WaitForSingleObject (mutex->sema, INFINITE) == WAIT_OBJECT_0) status = 0; else - status = 1; + { + /* WaitForSingleObject returns WAIT_FAILED, and we can only do + some best-effort cleanup here. */ + InterlockedDecrement (&mutex->counter); + status = 1; + } } return status; } @@ -174,7 +640,7 @@ __gthread_mutex_trylock (__gthread_mutex_t *mutex) if (__gthread_active_p ()) { - if (WaitForSingleObject (*mutex, 0) == WAIT_OBJECT_0) + if (__GTHR_W32_InterlockedCompareExchange (&mutex->counter, 0, -1) < 0) status = 0; else status = 1; @@ -186,10 +652,96 @@ static inline int __gthread_mutex_unlock (__gthread_mutex_t *mutex) { if (__gthread_active_p ()) - return (ReleaseMutex (*mutex) != 0) ? 0 : 1; - else - return 0; + { + if (InterlockedDecrement (&mutex->counter) >= 0) + return ReleaseSemaphore (mutex->sema, 1, NULL) ? 0 : 1; + } + return 0; +} + +static inline void +__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex) +{ + mutex->counter = -1; + mutex->depth = 0; + mutex->owner = 0; + mutex->sema = CreateSemaphore (NULL, 0, 65535, NULL); +} + +static inline int +__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex) +{ + if (__gthread_active_p ()) + { + DWORD me = GetCurrentThreadId(); + if (InterlockedIncrement (&mutex->counter) == 0) + { + mutex->depth = 1; + mutex->owner = me; + } + else if (mutex->owner == me) + { + InterlockedDecrement (&mutex->counter); + ++(mutex->depth); + } + else if (WaitForSingleObject (mutex->sema, INFINITE) == WAIT_OBJECT_0) + { + mutex->depth = 1; + mutex->owner = me; + } + else + { + /* WaitForSingleObject returns WAIT_FAILED, and we can only do + some best-effort cleanup here. */ + InterlockedDecrement (&mutex->counter); + return 1; + } + } + return 0; +} + +static inline int +__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex) +{ + if (__gthread_active_p ()) + { + DWORD me = GetCurrentThreadId(); + if (__GTHR_W32_InterlockedCompareExchange (&mutex->counter, 0, -1) < 0) + { + mutex->depth = 1; + mutex->owner = me; + } + else if (mutex->owner == me) + ++(mutex->depth); + else + return 1; + } + return 0; +} + +static inline int +__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex) +{ + if (__gthread_active_p ()) + { + --(mutex->depth); + if (mutex->depth == 0) + { + mutex->owner = 0; + + if (InterlockedDecrement (&mutex->counter) >= 0) + return ReleaseSemaphore (mutex->sema, 1, NULL) ? 0 : 1; + } + } + return 0; +} + +#endif /* __GTHREAD_HIDE_WIN32API */ + +#ifdef __cplusplus } +#endif -#endif /* not __gthr_win32_h */ +#endif /* _LIBOBJC */ +#endif /* ! GCC_GTHR_WIN32_H */