131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <assert.h>
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#include "uv.h"
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#include "internal.h"
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#include "handle-inl.h"
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#include "req-inl.h"
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/* Atomic set operation on char */
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#ifdef _MSC_VER /* MSVC */
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/* _InterlockedOr8 is supported by MSVC on x32 and x64. It is slightly less */
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/* efficient than InterlockedExchange, but InterlockedExchange8 does not */
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/* exist, and interlocked operations on larger targets might require the */
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/* target to be aligned. */
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#pragma intrinsic(_InterlockedOr8)
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static char __declspec(inline) uv_atomic_exchange_set(char volatile* target) {
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return _InterlockedOr8(target, 1);
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}
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#else /* GCC */
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/* Mingw-32 version, hopefully this works for 64-bit gcc as well. */
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static inline char uv_atomic_exchange_set(char volatile* target) {
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const char one = 1;
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char old_value;
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__asm__ __volatile__ ("lock xchgb %0, %1\n\t"
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: "=r"(old_value), "=m"(*target)
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: "0"(one), "m"(*target)
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: "memory");
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return old_value;
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}
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#endif
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void uv_async_endgame(uv_loop_t* loop, uv_async_t* handle) {
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if (handle->flags & UV_HANDLE_CLOSING &&
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!handle->async_sent) {
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assert(!(handle->flags & UV_HANDLE_CLOSED));
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uv__handle_stop(handle);
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uv__handle_close(handle);
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}
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}
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int uv_async_init(uv_loop_t* loop, uv_async_t* handle, uv_async_cb async_cb) {
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uv_req_t* req;
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uv__handle_init(loop, (uv_handle_t*) handle, UV_ASYNC);
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handle->async_sent = 0;
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handle->async_cb = async_cb;
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req = &handle->async_req;
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uv_req_init(loop, req);
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req->type = UV_WAKEUP;
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req->data = handle;
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loop->counters.async_init++;
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uv__handle_start(handle);
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return 0;
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}
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void uv_async_close(uv_loop_t* loop, uv_async_t* handle) {
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if (!((uv_async_t*)handle)->async_sent) {
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uv_want_endgame(loop, (uv_handle_t*) handle);
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}
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uv__handle_start(handle);
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}
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int uv_async_send(uv_async_t* handle) {
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uv_loop_t* loop = handle->loop;
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if (handle->type != UV_ASYNC) {
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/* Can't set errno because that's not thread-safe. */
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return -1;
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}
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/* The user should make sure never to call uv_async_send to a closing */
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/* or closed handle. */
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assert(!(handle->flags & UV_HANDLE_CLOSING));
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if (!uv_atomic_exchange_set(&handle->async_sent)) {
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POST_COMPLETION_FOR_REQ(loop, &handle->async_req);
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}
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return 0;
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}
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void uv_process_async_wakeup_req(uv_loop_t* loop, uv_async_t* handle,
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uv_req_t* req) {
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assert(handle->type == UV_ASYNC);
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assert(req->type == UV_WAKEUP);
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handle->async_sent = 0;
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if (!(handle->flags & UV_HANDLE_CLOSING)) {
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handle->async_cb((uv_async_t*) handle, 0);
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} else {
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uv_want_endgame(loop, (uv_handle_t*)handle);
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}
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}
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