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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "src/core/lib/iomgr/port.h"
#ifdef GRPC_UV
#include <uv.h>
#include <string.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include "src/core/lib/iomgr/pollset.h"
#include "src/core/lib/iomgr/pollset_uv.h"
struct grpc_pollset {
uv_timer_t timer;
int shutting_down;
};
/* Indicates that grpc_pollset_work should run an iteration of the UV loop
before running callbacks. This defaults to 1, and should be disabled if
grpc_pollset_work will be called within the callstack of uv_run */
int grpc_pollset_work_run_loop;
gpr_mu grpc_polling_mu;
size_t grpc_pollset_size() { return sizeof(grpc_pollset); }
void grpc_pollset_global_init(void) {
gpr_mu_init(&grpc_polling_mu);
grpc_pollset_work_run_loop = 1;
}
void grpc_pollset_global_shutdown(void) { gpr_mu_destroy(&grpc_polling_mu); }
void grpc_pollset_init(grpc_pollset *pollset, gpr_mu **mu) {
*mu = &grpc_polling_mu;
memset(pollset, 0, sizeof(grpc_pollset));
uv_timer_init(uv_default_loop(), &pollset->timer);
pollset->shutting_down = 0;
}
static void timer_close_cb(uv_handle_t *handle) { handle->data = (void *)1; }
void grpc_pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
grpc_closure *closure) {
GPR_ASSERT(!pollset->shutting_down);
pollset->shutting_down = 1;
if (grpc_pollset_work_run_loop) {
// Drain any pending UV callbacks without blocking
uv_run(uv_default_loop(), UV_RUN_NOWAIT);
}
grpc_exec_ctx_sched(exec_ctx, closure, GRPC_ERROR_NONE, NULL);
}
void grpc_pollset_destroy(grpc_pollset *pollset) {
uv_close((uv_handle_t *)&pollset->timer, timer_close_cb);
// timer.data is a boolean indicating that the timer has finished closing
pollset->timer.data = (void *)0;
if (grpc_pollset_work_run_loop) {
while (!pollset->timer.data) {
uv_run(uv_default_loop(), UV_RUN_NOWAIT);
}
}
}
void grpc_pollset_reset(grpc_pollset *pollset) {
GPR_ASSERT(pollset->shutting_down);
pollset->shutting_down = 0;
}
static void timer_run_cb(uv_timer_t *timer) {}
grpc_error *grpc_pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset,
grpc_pollset_worker **worker_hdl,
gpr_timespec now, gpr_timespec deadline) {
uint64_t timeout;
gpr_mu_unlock(&grpc_polling_mu);
if (grpc_pollset_work_run_loop) {
if (gpr_time_cmp(deadline, now) >= 0) {
timeout = (uint64_t)gpr_time_to_millis(gpr_time_sub(deadline, now));
} else {
timeout = 0;
}
/* We special-case timeout=0 so that we don't bother with the timer when
the loop won't block anyway */
if (timeout > 0) {
uv_timer_start(&pollset->timer, timer_run_cb, timeout, 0);
/* Run until there is some I/O activity or the timer triggers. It doesn't
matter which happens */
uv_run(uv_default_loop(), UV_RUN_ONCE);
uv_timer_stop(&pollset->timer);
} else {
uv_run(uv_default_loop(), UV_RUN_NOWAIT);
}
}
if (!grpc_closure_list_empty(exec_ctx->closure_list)) {
grpc_exec_ctx_flush(exec_ctx);
}
gpr_mu_lock(&grpc_polling_mu);
return GRPC_ERROR_NONE;
}
grpc_error *grpc_pollset_kick(grpc_pollset *pollset,
grpc_pollset_worker *specific_worker) {
return GRPC_ERROR_NONE;
}
#endif /* GRPC_UV */
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