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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