| 0,0 → 1,251 |
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| /* Implementation of Kos32-specific threads compatibility routines for |
| libgcc2. |
| |
| 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 3, 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. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "gthr-kos32.h" |
| |
| #define FUTEX_INIT 0 |
| #define FUTEX_DESTROY 1 |
| #define FUTEX_WAIT 2 |
| #define FUTEX_WAKE 3 |
| |
| unsigned int tls_alloc(void); |
| int tls_free(unsigned int key); |
| void *tls_get(unsigned int key); |
| void *tls_set(unsigned int key, void *val); |
| |
| #define exchange_acquire(ptr, new) \ |
| __atomic_exchange_4((ptr), (new), __ATOMIC_ACQUIRE) |
| |
| #define exchange_release(ptr, new) \ |
| __atomic_exchange_4((ptr), (new), __ATOMIC_RELEASE) |
| |
| |
| static inline void yield(void) |
| { |
| __asm__ __volatile__( |
| "int $0x40" |
| ::"a"(68), "b"(1)); |
| }; |
| |
| |
| |
| int __gthr_kos32_once (__gthread_once_t *once, void (*func) (void)) |
| { |
| if (once == NULL || func == NULL) |
| return EINVAL; |
| |
| if (! once->done) |
| { |
| if (__sync_add_and_fetch(&(once->started), 1) == 0) |
| { |
| (*func) (); |
| once->done = 1; |
| } |
| else |
| { |
| while (! once->done) |
| yield(); |
| } |
| } |
| return 0; |
| }; |
| |
| int __gthr_kos32_key_create (__gthread_key_t *key, |
| void (*dtor) (void *) __attribute__((unused))) |
| { |
| int status = 0; |
| unsigned int tls_index = tls_alloc(); |
| 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 = -1; |
| return status; |
| } |
| |
| int __gthr_kos32_key_delete (__gthread_key_t key) |
| { |
| return tls_free(key); |
| } |
| |
| void* __gthr_kos32_getspecific (__gthread_key_t key) |
| { |
| void *ptr; |
| ptr = tls_get(key); |
| return ptr; |
| } |
| |
| int __gthr_kos32_setspecific (__gthread_key_t key, const void *ptr) |
| { |
| tls_set(key, CONST_CAST2(void *, const void *, ptr)); |
| return 0; |
| } |
| |
| void __gthr_kos32_mutex_init_function (__gthread_mutex_t *mutex) |
| { |
| int handle; |
| |
| mutex->lock = 0; |
| |
| __asm__ volatile( |
| "int $0x40\t" |
| :"=a"(handle) |
| :"a"(77),"b"(FUTEX_INIT),"c"(mutex)); |
| mutex->handle = handle; |
| } |
| |
| void __gthr_kos32_mutex_destroy (__gthread_mutex_t *mutex) |
| { |
| int retval; |
| |
| __asm__ volatile( |
| "int $0x40\t" |
| :"=a"(retval) |
| :"a"(77),"b"(FUTEX_DESTROY),"c"(mutex->handle)); |
| } |
| |
| int __gthr_kos32_mutex_lock (__gthread_mutex_t *mutex) |
| { |
| int tmp; |
| |
| if( __sync_fetch_and_add(&mutex->lock, 1) == 0) |
| return 0; |
| |
| while (exchange_acquire (&mutex->lock, 2) != 0) |
| { |
| __asm__ volatile( |
| "int $0x40\t\n" |
| :"=a"(tmp) |
| :"a"(77),"b"(FUTEX_WAIT), |
| "c"(mutex->handle),"d"(2),"S"(0)); |
| } |
| return 0; |
| } |
| |
| int __gthr_kos32_mutex_trylock (__gthread_mutex_t *mutex) |
| { |
| int zero = 0; |
| |
| return __atomic_compare_exchange_4(&mutex->lock, &zero, 1,0,__ATOMIC_ACQUIRE,__ATOMIC_RELAXED); |
| } |
| |
| int __gthr_kos32_mutex_unlock (__gthread_mutex_t *mutex) |
| { |
| int prev; |
| |
| prev = exchange_release (&mutex->lock, 0); |
| |
| if (prev != 1) |
| { |
| __asm__ volatile( |
| "int $0x40\t" |
| :"=a"(prev) |
| :"a"(77),"b"(FUTEX_WAKE), |
| "c"(mutex->handle),"d"(1)); |
| }; |
| return 0; |
| } |
| |
| void __gthr_kos32_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex) |
| { |
| // mutex->counter = -1; |
| mutex->depth = 0; |
| mutex->owner = 0; |
| // mutex->sema = CreateSemaphoreW (NULL, 0, 65535, NULL); |
| } |
| |
| #if 0 |
| int |
| __gthr_win32_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex) |
| { |
| 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; |
| } |
| |
| int |
| __gthr_win32_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex) |
| { |
| 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; |
| } |
| |
| int |
| __gthr_win32_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex) |
| { |
| --(mutex->depth); |
| if (mutex->depth == 0) |
| { |
| mutex->owner = 0; |
| |
| if (InterlockedDecrement (&mutex->counter) >= 0) |
| return ReleaseSemaphore (mutex->sema, 1, NULL) ? 0 : 1; |
| } |
| |
| return 0; |
| } |
| |
| int |
| __gthr_win32_recursive_mutex_destroy (__gthread_recursive_mutex_t *mutex) |
| { |
| CloseHandle ((HANDLE) mutex->sema); |
| return 0; |
| } |
| |
| #endif |