makefile~

设有两个并发执行的父子进程

 srcs = ppipe.c
objs = ppipe.o
opts = -g -c
all:	ppipe
psched:	psched.o
	gcc psched.o -o psched
psched.o:	psched.c	pctl.h
	gcc -g -c psched.c
clean:
	rm psched *.o