libev-ev_timer定时器的理解

1.相关说明

本文主要自己对于libev的ev_timer定时器的代码流程梳理，主要有ev_timer结构体定义变量的初始化，定时器变量的参数设置，定时器变量的使用

2.相关代码流程

下面是图片

3.相关实现代码

main.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ev.h>
static void timer_cb(struct ev_loop *loop, ev_timer *w, int revents)
{
	fprintf(stdout, "%fs timeout\n", w->repeat);
	// ev_break(loop, EVBREAK_ALL);
}
int main()
{
	struct ev_loop *loop;
	ev_timer *timer_watcher;
	loop = ev_default_loop(EVFLAG_NOENV);
	timer_watcher = calloc(1, sizeof(*timer_watcher));
	assert(("can not alloc memory", loop && timer_watcher));
	ev_timer_init(timer_watcher, timer_cb, 0, 2);
	ev_timer_start(loop, timer_watcher);
	ev_run(loop, 0);
	ev_loop_destroy(loop);
	free(timer_watcher);
}

makefile

target := main
CC := gcc
CFLAGS += -g -Wall -fPIC
LDFLAGS += -lev
INC = -I /usr/local/libev/include
LIB = -L /usr/local/libev/lib
src += \
	main.c
obj := $(patsubst %.c, %.o, $(src))

$(target):$(obj)
	$(CC) -o $@ $^ $(INC) $(LIB) $(LDFLAGS) 

%.o:%.c
	$(CC) -o $@ -c $< $(INC) $(LIB) $(LDFLAGS) 

.PHONY:clean

clean:
	@rm -rf $(target) *.o