| /* Select()-based ae.c module. |
| * |
| * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com> |
| * 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 Redis 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 <string.h> |
| |
| typedef struct aeApiState { |
| fd_set rfds, wfds; |
| /* We need to have a copy of the fd sets as it's not safe to reuse |
| * FD sets after select(). */ |
| fd_set _rfds, _wfds; |
| } aeApiState; |
| |
| static int aeApiCreate(aeEventLoop *eventLoop) { |
| aeApiState *state = zmalloc(sizeof(aeApiState)); |
| |
| if (!state) return -1; |
| FD_ZERO(&state->rfds); |
| FD_ZERO(&state->wfds); |
| eventLoop->apidata = state; |
| return 0; |
| } |
| |
| static void aeApiFree(aeEventLoop *eventLoop) { |
| zfree(eventLoop->apidata); |
| } |
| |
| static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask) { |
| aeApiState *state = eventLoop->apidata; |
| |
| if (mask & AE_READABLE) FD_SET(fd,&state->rfds); |
| if (mask & AE_WRITABLE) FD_SET(fd,&state->wfds); |
| return 0; |
| } |
| |
| static void aeApiDelEvent(aeEventLoop *eventLoop, int fd, int mask) { |
| aeApiState *state = eventLoop->apidata; |
| |
| if (mask & AE_READABLE) FD_CLR(fd,&state->rfds); |
| if (mask & AE_WRITABLE) FD_CLR(fd,&state->wfds); |
| } |
| |
| static int aeApiPoll(aeEventLoop *eventLoop, struct timeval *tvp) { |
| aeApiState *state = eventLoop->apidata; |
| int retval, j, numevents = 0; |
| |
| memcpy(&state->_rfds,&state->rfds,sizeof(fd_set)); |
| memcpy(&state->_wfds,&state->wfds,sizeof(fd_set)); |
| |
| retval = select(eventLoop->maxfd+1, |
| &state->_rfds,&state->_wfds,NULL,tvp); |
| if (retval > 0) { |
| for (j = 0; j <= eventLoop->maxfd; j++) { |
| int mask = 0; |
| aeFileEvent *fe = &eventLoop->events[j]; |
| |
| if (fe->mask == AE_NONE) continue; |
| if (fe->mask & AE_READABLE && FD_ISSET(j,&state->_rfds)) |
| mask |= AE_READABLE; |
| if (fe->mask & AE_WRITABLE && FD_ISSET(j,&state->_wfds)) |
| mask |= AE_WRITABLE; |
| eventLoop->fired[numevents].fd = j; |
| eventLoop->fired[numevents].mask = mask; |
| numevents++; |
| } |
| } |
| return numevents; |
| } |
| |
| static char *aeApiName(void) { |
| return "select"; |
| } |