/* * Copyright (C) the libgit2 contributors. All rights reserved. * * This file is part of libgit2, distributed under the GNU GPL v2 with * a Linking Exception. For full terms see the included COPYING file. */ #include "pthread.h" #include "../global.h" int pthread_create( pthread_t *GIT_RESTRICT thread, const pthread_attr_t *GIT_RESTRICT attr, void *(*start_routine)(void*), void *GIT_RESTRICT arg) { GIT_UNUSED(attr); *thread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)start_routine, arg, 0, NULL); return *thread ? 0 : -1; } int pthread_join(pthread_t thread, void **value_ptr) { DWORD ret = WaitForSingleObject(thread, INFINITE); if (ret == WAIT_OBJECT_0) { if (value_ptr != NULL) { *value_ptr = NULL; GetExitCodeThread(thread, (void *)value_ptr); } CloseHandle(thread); return 0; } return -1; } int pthread_mutex_init( pthread_mutex_t *GIT_RESTRICT mutex, const pthread_mutexattr_t *GIT_RESTRICT mutexattr) { GIT_UNUSED(mutexattr); InitializeCriticalSection(mutex); return 0; } int pthread_mutex_destroy(pthread_mutex_t *mutex) { DeleteCriticalSection(mutex); return 0; } int pthread_mutex_lock(pthread_mutex_t *mutex) { EnterCriticalSection(mutex); return 0; } int pthread_mutex_unlock(pthread_mutex_t *mutex) { LeaveCriticalSection(mutex); return 0; } int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr) { /* We don't support non-default attributes. */ if (attr) return EINVAL; /* This is an auto-reset event. */ *cond = CreateEventW(NULL, FALSE, FALSE, NULL); assert(*cond); /* If we can't create the event, claim that the reason was out-of-memory. * The actual reason can be fetched with GetLastError(). */ return *cond ? 0 : ENOMEM; } int pthread_cond_destroy(pthread_cond_t *cond) { BOOL closed; if (!cond) return EINVAL; closed = CloseHandle(*cond); assert(closed); GIT_UNUSED(closed); *cond = NULL; return 0; } int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) { int error; DWORD wait_result; if (!cond || !mutex) return EINVAL; /* The caller must be holding the mutex. */ error = pthread_mutex_unlock(mutex); if (error) return error; wait_result = WaitForSingleObject(*cond, INFINITE); assert(WAIT_OBJECT_0 == wait_result); GIT_UNUSED(wait_result); return pthread_mutex_lock(mutex); } int pthread_cond_signal(pthread_cond_t *cond) { BOOL signaled; if (!cond) return EINVAL; signaled = SetEvent(*cond); assert(signaled); GIT_UNUSED(signaled); return 0; } /* pthread_cond_broadcast is not implemented because doing so with just * Win32 events is quite complicated, and no caller in libgit2 uses it * yet. */ int pthread_num_processors_np(void) { DWORD_PTR p, s; int n = 0; if (GetProcessAffinityMask(GetCurrentProcess(), &p, &s)) for (; p; p >>= 1) n += p&1; return n ? n : 1; } static HINSTANCE win32_kernel32_dll; typedef void (WINAPI *win32_srwlock_fn)(GIT_SRWLOCK *); static win32_srwlock_fn win32_srwlock_initialize; static win32_srwlock_fn win32_srwlock_acquire_shared; static win32_srwlock_fn win32_srwlock_release_shared; static win32_srwlock_fn win32_srwlock_acquire_exclusive; static win32_srwlock_fn win32_srwlock_release_exclusive; int pthread_rwlock_init( pthread_rwlock_t *GIT_RESTRICT lock, const pthread_rwlockattr_t *GIT_RESTRICT attr) { (void)attr; if (win32_srwlock_initialize) win32_srwlock_initialize(&lock->native.srwl); else InitializeCriticalSection(&lock->native.csec); return 0; } int pthread_rwlock_rdlock(pthread_rwlock_t *lock) { if (win32_srwlock_acquire_shared) win32_srwlock_acquire_shared(&lock->native.srwl); else EnterCriticalSection(&lock->native.csec); return 0; } int pthread_rwlock_rdunlock(pthread_rwlock_t *lock) { if (win32_srwlock_release_shared) win32_srwlock_release_shared(&lock->native.srwl); else LeaveCriticalSection(&lock->native.csec); return 0; } int pthread_rwlock_wrlock(pthread_rwlock_t *lock) { if (win32_srwlock_acquire_exclusive) win32_srwlock_acquire_exclusive(&lock->native.srwl); else EnterCriticalSection(&lock->native.csec); return 0; } int pthread_rwlock_wrunlock(pthread_rwlock_t *lock) { if (win32_srwlock_release_exclusive) win32_srwlock_release_exclusive(&lock->native.srwl); else LeaveCriticalSection(&lock->native.csec); return 0; } int pthread_rwlock_destroy(pthread_rwlock_t *lock) { if (!win32_srwlock_initialize) DeleteCriticalSection(&lock->native.csec); git__memzero(lock, sizeof(*lock)); return 0; } static void win32_pthread_shutdown(void) { if (win32_kernel32_dll) { FreeLibrary(win32_kernel32_dll); win32_kernel32_dll = NULL; } } int win32_pthread_initialize(void) { if (win32_kernel32_dll) return 0; win32_kernel32_dll = LoadLibrary("Kernel32.dll"); if (!win32_kernel32_dll) { giterr_set(GITERR_OS, "Could not load Kernel32.dll!"); return -1; } win32_srwlock_initialize = (win32_srwlock_fn) GetProcAddress(win32_kernel32_dll, "InitializeSRWLock"); win32_srwlock_acquire_shared = (win32_srwlock_fn) GetProcAddress(win32_kernel32_dll, "AcquireSRWLockShared"); win32_srwlock_release_shared = (win32_srwlock_fn) GetProcAddress(win32_kernel32_dll, "ReleaseSRWLockShared"); win32_srwlock_acquire_exclusive = (win32_srwlock_fn) GetProcAddress(win32_kernel32_dll, "AcquireSRWLockExclusive"); win32_srwlock_release_exclusive = (win32_srwlock_fn) GetProcAddress(win32_kernel32_dll, "ReleaseSRWLockExclusive"); git__on_shutdown(win32_pthread_shutdown); return 0; }