if ((fd0 = open("/dev/rtf0", O_RDONLY)) < 0) {

      fprintf(stderr, "Error opening /dev/rtf0\n");

      exit(1);

}

while (1) {

      n = read(fd0, &samp, sizeof(samp));

      printf("min: %8d, max: %8d\n", (int) samp.min, (int) samp.max);

      fflush(stdout);

}

return 0;

}

4.3.3  编译和运行程序

在一台Celeron 412MHz，196MB内存，RTLinux3.1的机器上进行如下的Makefile编译：

all: rt_process.o irqsema.o monitor histplot

include ../../rtl.mk

monitor: monitor.c

$(CC) ${USER_CFLAGS} ${INCLUDE} -Wall -O2 -o monitor monitor.c

clean:

rm -f *.o monitor histplot periodic_monitor gnuplot.out

include $(RTL_DIR)/Rules.make

则程序可以测试调度的时间精度，程序的运行结果为：

min:        0, max:    24480

min:        0, max:    10720

min:        0, max:    10912

min:        0, max:    10976

min:        0, max:    11072

min:        0, max:    10656

min:        0, max:    10944

min:        0, max:    11200

min:        0, max:    11200

min:        0, max:    11008

min:        0, max:    10912

.........

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