git.saurik.com Git - redis.git/blame

Commit	Line	Data
d288ee65	1	/* Select()-based ae.c module.
	2	*
	3	* Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
	4	* All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions are met:
	8	*
	9	* * Redistributions of source code must retain the above copyright notice,
	10	* this list of conditions and the following disclaimer.
	11	* * Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	* * Neither the name of Redis nor the names of its contributors may be used
	15	* to endorse or promote products derived from this software without
	16	* specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	19	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	20	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	21	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	22	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	23	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	24	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	25	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	26	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	27	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	28	* POSSIBILITY OF SUCH DAMAGE.
	29	*/
	30
a51dcb8b	31
	32	#include <string.h>
	33
	34	typedef struct aeApiState {
621d5c19	35	fd_set rfds, wfds;
a51dcb8b	36	/* We need to have a copy of the fd sets as it's not safe to reuse
a51dcb8b	37	* FD sets after select(). */
621d5c19	38	fd_set _rfds, _wfds;
a51dcb8b	39	} aeApiState;
	40
	41	static int aeApiCreate(aeEventLoop *eventLoop) {
	42	aeApiState *state = zmalloc(sizeof(aeApiState));
	43
	44	if (!state) return -1;
	45	FD_ZERO(&state->rfds);
	46	FD_ZERO(&state->wfds);
a51dcb8b	47	eventLoop->apidata = state;
	48	return 0;
	49	}
	50
	51	static void aeApiFree(aeEventLoop *eventLoop) {
	52	zfree(eventLoop->apidata);
	53	}
	54
	55	static int aeApiAddEvent(aeEventLoop *eventLoop, int fd, int mask) {
	56	aeApiState *state = eventLoop->apidata;
	57
	58	if (mask & AE_READABLE) FD_SET(fd,&state->rfds);
	59	if (mask & AE_WRITABLE) FD_SET(fd,&state->wfds);
a51dcb8b	60	return 0;
	61	}
	62
	63	static void aeApiDelEvent(aeEventLoop *eventLoop, int fd, int mask) {
	64	aeApiState *state = eventLoop->apidata;
	65
	66	if (mask & AE_READABLE) FD_CLR(fd,&state->rfds);
	67	if (mask & AE_WRITABLE) FD_CLR(fd,&state->wfds);
a51dcb8b	68	}
	69
	70	static int aeApiPoll(aeEventLoop eventLoop, struct timeval tvp) {
	71	aeApiState *state = eventLoop->apidata;
	72	int retval, j, numevents = 0;
	73
	74	memcpy(&state->_rfds,&state->rfds,sizeof(fd_set));
	75	memcpy(&state->_wfds,&state->wfds,sizeof(fd_set));
a51dcb8b	76
a51dcb8b	77	retval = select(eventLoop->maxfd+1,
621d5c19	78	&state->_rfds,&state->_wfds,NULL,tvp);
a51dcb8b	79	if (retval > 0) {
	80	for (j = 0; j <= eventLoop->maxfd; j++) {
	81	int mask = 0;
	82	aeFileEvent *fe = &eventLoop->events[j];
	83
	84	if (fe->mask == AE_NONE) continue;
	85	if (fe->mask & AE_READABLE && FD_ISSET(j,&state->_rfds))
	86	mask \|= AE_READABLE;
	87	if (fe->mask & AE_WRITABLE && FD_ISSET(j,&state->_wfds))
	88	mask \|= AE_WRITABLE;
a51dcb8b	89	eventLoop->fired[numevents].fd = j;
	90	eventLoop->fired[numevents].mask = mask;
	91	numevents++;
	92	}
	93	}
	94	return numevents;
	95	}
7a932b74	96
	97	static char *aeApiName(void) {
	98	return "select";
	99	}