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/*
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* Copyright (C) the libgit2 contributors. All rights reserved.
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*
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* This file is part of libgit2, distributed under the GNU GPL v2 with
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* a Linking Exception. For full terms see the included COPYING file.
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*/
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#include "thread.h"
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#include "../global.h"
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#define CLEAN_THREAD_EXIT 0x6F012842
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typedef void (WINAPI *win32_srwlock_fn)(GIT_SRWLOCK *);
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static win32_srwlock_fn win32_srwlock_initialize;
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static win32_srwlock_fn win32_srwlock_acquire_shared;
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static win32_srwlock_fn win32_srwlock_release_shared;
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static win32_srwlock_fn win32_srwlock_acquire_exclusive;
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static win32_srwlock_fn win32_srwlock_release_exclusive;
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/* The thread procedure stub used to invoke the caller's procedure
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* and capture the return value for later collection. Windows will
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* only hold a DWORD, but we need to be able to store an entire
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* void pointer. This requires the indirection. */
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static DWORD WINAPI git_win32__threadproc(LPVOID lpParameter)
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{
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git_thread *thread = lpParameter;
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/* Set the current thread for `git_thread_exit` */
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GIT_GLOBAL->current_thread = thread;
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thread->result = thread->proc(thread->param);
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git__free_tls_data();
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return CLEAN_THREAD_EXIT;
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}
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int git_threads_init(void)
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{
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HMODULE hModule = GetModuleHandleW(L"kernel32");
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if (hModule) {
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win32_srwlock_initialize = (win32_srwlock_fn)
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GetProcAddress(hModule, "InitializeSRWLock");
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win32_srwlock_acquire_shared = (win32_srwlock_fn)
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GetProcAddress(hModule, "AcquireSRWLockShared");
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win32_srwlock_release_shared = (win32_srwlock_fn)
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GetProcAddress(hModule, "ReleaseSRWLockShared");
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win32_srwlock_acquire_exclusive = (win32_srwlock_fn)
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GetProcAddress(hModule, "AcquireSRWLockExclusive");
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win32_srwlock_release_exclusive = (win32_srwlock_fn)
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GetProcAddress(hModule, "ReleaseSRWLockExclusive");
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}
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return 0;
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}
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int git_thread_create(
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git_thread *GIT_RESTRICT thread,
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void *(*start_routine)(void*),
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void *GIT_RESTRICT arg)
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{
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thread->result = NULL;
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thread->param = arg;
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thread->proc = start_routine;
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thread->thread = CreateThread(
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NULL, 0, git_win32__threadproc, thread, 0, NULL);
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return thread->thread ? 0 : -1;
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}
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int git_thread_join(
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git_thread *thread,
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void **value_ptr)
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{
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DWORD exit;
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if (WaitForSingleObject(thread->thread, INFINITE) != WAIT_OBJECT_0)
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return -1;
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if (!GetExitCodeThread(thread->thread, &exit)) {
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CloseHandle(thread->thread);
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return -1;
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}
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/* Check for the thread having exited uncleanly. If exit was unclean,
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* then we don't have a return value to give back to the caller. */
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if (exit != CLEAN_THREAD_EXIT) {
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assert(false);
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thread->result = NULL;
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}
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if (value_ptr)
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*value_ptr = thread->result;
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CloseHandle(thread->thread);
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return 0;
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}
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void git_thread_exit(void *value)
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{
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assert(GIT_GLOBAL->current_thread);
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GIT_GLOBAL->current_thread->result = value;
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git__free_tls_data();
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ExitThread(CLEAN_THREAD_EXIT);
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}
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size_t git_thread_currentid(void)
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{
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return GetCurrentThreadId();
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}
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int git_mutex_init(git_mutex *GIT_RESTRICT mutex)
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{
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InitializeCriticalSection(mutex);
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return 0;
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}
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int git_mutex_free(git_mutex *mutex)
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{
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DeleteCriticalSection(mutex);
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return 0;
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}
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int git_mutex_lock(git_mutex *mutex)
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{
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EnterCriticalSection(mutex);
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return 0;
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}
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int git_mutex_unlock(git_mutex *mutex)
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{
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LeaveCriticalSection(mutex);
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return 0;
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}
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int git_cond_init(git_cond *cond)
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{
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/* This is an auto-reset event. */
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*cond = CreateEventW(NULL, FALSE, FALSE, NULL);
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assert(*cond);
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/* If we can't create the event, claim that the reason was out-of-memory.
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* The actual reason can be fetched with GetLastError(). */
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return *cond ? 0 : ENOMEM;
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}
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int git_cond_free(git_cond *cond)
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{
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BOOL closed;
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if (!cond)
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return EINVAL;
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closed = CloseHandle(*cond);
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assert(closed);
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GIT_UNUSED(closed);
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*cond = NULL;
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return 0;
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}
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int git_cond_wait(git_cond *cond, git_mutex *mutex)
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{
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int error;
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DWORD wait_result;
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if (!cond || !mutex)
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return EINVAL;
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/* The caller must be holding the mutex. */
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error = git_mutex_unlock(mutex);
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if (error)
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return error;
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wait_result = WaitForSingleObject(*cond, INFINITE);
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assert(WAIT_OBJECT_0 == wait_result);
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GIT_UNUSED(wait_result);
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return git_mutex_lock(mutex);
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}
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int git_cond_signal(git_cond *cond)
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{
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BOOL signaled;
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if (!cond)
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return EINVAL;
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signaled = SetEvent(*cond);
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assert(signaled);
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GIT_UNUSED(signaled);
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return 0;
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}
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int git_rwlock_init(git_rwlock *GIT_RESTRICT lock)
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{
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if (win32_srwlock_initialize)
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win32_srwlock_initialize(&lock->native.srwl);
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else
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InitializeCriticalSection(&lock->native.csec);
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return 0;
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}
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int git_rwlock_rdlock(git_rwlock *lock)
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{
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if (win32_srwlock_acquire_shared)
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win32_srwlock_acquire_shared(&lock->native.srwl);
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else
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EnterCriticalSection(&lock->native.csec);
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return 0;
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}
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int git_rwlock_rdunlock(git_rwlock *lock)
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{
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if (win32_srwlock_release_shared)
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win32_srwlock_release_shared(&lock->native.srwl);
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else
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LeaveCriticalSection(&lock->native.csec);
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return 0;
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}
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int git_rwlock_wrlock(git_rwlock *lock)
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{
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if (win32_srwlock_acquire_exclusive)
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win32_srwlock_acquire_exclusive(&lock->native.srwl);
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else
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EnterCriticalSection(&lock->native.csec);
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return 0;
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}
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int git_rwlock_wrunlock(git_rwlock *lock)
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{
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if (win32_srwlock_release_exclusive)
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win32_srwlock_release_exclusive(&lock->native.srwl);
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else
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LeaveCriticalSection(&lock->native.csec);
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return 0;
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}
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int git_rwlock_free(git_rwlock *lock)
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{
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if (!win32_srwlock_initialize)
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DeleteCriticalSection(&lock->native.csec);
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git__memzero(lock, sizeof(*lock));
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return 0;
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}
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