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/*
*
* Copyright 2016 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc/support/port_platform.h>
#include "src/core/lib/iomgr/port.h"
#ifdef GRPC_POSIX_WAKEUP_FD
#include "src/core/lib/iomgr/wakeup_fd_cv.h"
#include <errno.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/time.h>
#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/gprpp/thd.h"
#define MAX_TABLE_RESIZE 256
extern grpc_cv_fd_table g_cvfds;
static grpc_error* cv_fd_init(grpc_wakeup_fd* fd_info) {
unsigned int i, newsize;
int idx;
gpr_mu_lock(&g_cvfds.mu);
if (!g_cvfds.free_fds) {
newsize = GPR_MIN(g_cvfds.size * 2, g_cvfds.size + MAX_TABLE_RESIZE);
g_cvfds.cvfds = static_cast<grpc_fd_node*>(
gpr_realloc(g_cvfds.cvfds, sizeof(grpc_fd_node) * newsize));
for (i = g_cvfds.size; i < newsize; i++) {
g_cvfds.cvfds[i].is_set = 0;
g_cvfds.cvfds[i].cvs = nullptr;
g_cvfds.cvfds[i].next_free = g_cvfds.free_fds;
g_cvfds.free_fds = &g_cvfds.cvfds[i];
}
g_cvfds.size = newsize;
}
idx = static_cast<int>(g_cvfds.free_fds - g_cvfds.cvfds);
g_cvfds.free_fds = g_cvfds.free_fds->next_free;
g_cvfds.cvfds[idx].cvs = nullptr;
g_cvfds.cvfds[idx].is_set = 0;
fd_info->read_fd = GRPC_IDX_TO_FD(idx);
fd_info->write_fd = -1;
gpr_mu_unlock(&g_cvfds.mu);
return GRPC_ERROR_NONE;
}
static grpc_error* cv_fd_wakeup(grpc_wakeup_fd* fd_info) {
grpc_cv_node* cvn;
gpr_mu_lock(&g_cvfds.mu);
g_cvfds.cvfds[GRPC_FD_TO_IDX(fd_info->read_fd)].is_set = 1;
cvn = g_cvfds.cvfds[GRPC_FD_TO_IDX(fd_info->read_fd)].cvs;
while (cvn) {
gpr_cv_signal(cvn->cv);
cvn = cvn->next;
}
gpr_mu_unlock(&g_cvfds.mu);
return GRPC_ERROR_NONE;
}
static grpc_error* cv_fd_consume(grpc_wakeup_fd* fd_info) {
gpr_mu_lock(&g_cvfds.mu);
g_cvfds.cvfds[GRPC_FD_TO_IDX(fd_info->read_fd)].is_set = 0;
gpr_mu_unlock(&g_cvfds.mu);
return GRPC_ERROR_NONE;
}
static void cv_fd_destroy(grpc_wakeup_fd* fd_info) {
if (fd_info->read_fd == 0) {
return;
}
gpr_mu_lock(&g_cvfds.mu);
// Assert that there are no active pollers
GPR_ASSERT(!g_cvfds.cvfds[GRPC_FD_TO_IDX(fd_info->read_fd)].cvs);
g_cvfds.cvfds[GRPC_FD_TO_IDX(fd_info->read_fd)].next_free = g_cvfds.free_fds;
g_cvfds.free_fds = &g_cvfds.cvfds[GRPC_FD_TO_IDX(fd_info->read_fd)];
gpr_mu_unlock(&g_cvfds.mu);
}
static int cv_check_availability(void) { return 1; }
const grpc_wakeup_fd_vtable grpc_cv_wakeup_fd_vtable = {
cv_fd_init, cv_fd_consume, cv_fd_wakeup, cv_fd_destroy,
cv_check_availability};
#endif /* GRPC_POSIX_WAKUP_FD */
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