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a8b6596d23
Most of the ae.c backends didn't explicitly handle errors, and instead ignored all errors and did an implicit retry. This is desired for EAGAIN and EINTER, but in case of other systematic errors, we prefer to fail and log the error we got rather than get into a busy loop.
110 lines
3.8 KiB
C
110 lines
3.8 KiB
C
/* Select()-based ae.c module.
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*
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* Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/select.h>
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#include <string.h>
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typedef struct aeApiState {
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fd_set rfds, wfds;
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/* We need to have a copy of the fd sets as it's not safe to reuse
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* FD sets after select(). */
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fd_set _rfds, _wfds;
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} aeApiState;
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static int aeApiCreate(aeEventLoop *eventLoop) {
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aeApiState *state = zmalloc(sizeof(aeApiState));
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if (!state) return -1;
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FD_ZERO(&state->rfds);
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FD_ZERO(&state->wfds);
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eventLoop->apidata = state;
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return 0;
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}
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static int aeApiResize(aeEventLoop *eventLoop, int setsize) {
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/* Just ensure we have enough room in the fd_set type. */
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if (setsize >= FD_SETSIZE) return -1;
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return 0;
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}
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static void aeApiFree(aeEventLoop *eventLoop) {
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zfree(eventLoop->apidata);
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}
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static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask) {
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aeApiState *state = eventLoop->apidata;
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if (mask & AE_READABLE) FD_SET(fd,&state->rfds);
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if (mask & AE_WRITABLE) FD_SET(fd,&state->wfds);
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return 0;
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}
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static void aeApiDelEvent(aeEventLoop *eventLoop, int fd, int mask) {
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aeApiState *state = eventLoop->apidata;
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if (mask & AE_READABLE) FD_CLR(fd,&state->rfds);
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if (mask & AE_WRITABLE) FD_CLR(fd,&state->wfds);
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}
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static int aeApiPoll(aeEventLoop *eventLoop, struct timeval *tvp) {
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aeApiState *state = eventLoop->apidata;
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int retval, j, numevents = 0;
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memcpy(&state->_rfds,&state->rfds,sizeof(fd_set));
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memcpy(&state->_wfds,&state->wfds,sizeof(fd_set));
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retval = select(eventLoop->maxfd+1,
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&state->_rfds,&state->_wfds,NULL,tvp);
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if (retval > 0) {
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for (j = 0; j <= eventLoop->maxfd; j++) {
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int mask = 0;
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aeFileEvent *fe = &eventLoop->events[j];
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if (fe->mask == AE_NONE) continue;
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if (fe->mask & AE_READABLE && FD_ISSET(j,&state->_rfds))
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mask |= AE_READABLE;
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if (fe->mask & AE_WRITABLE && FD_ISSET(j,&state->_wfds))
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mask |= AE_WRITABLE;
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eventLoop->fired[numevents].fd = j;
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eventLoop->fired[numevents].mask = mask;
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numevents++;
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}
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} else if (retval == -1 && errno != EINTR) {
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panic("aeApiPoll: select, %s", strerror(errno));
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}
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return numevents;
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}
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static char *aeApiName(void) {
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return "select";
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}
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