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all: FIRST SECOND
TMPFILE ?= $(CURDIR)/parallel.mk.lock
rmtmpfile:
@rm -f "$(TMPFILE)"
FIRST: rmtmpfile
@c=0; \
while [ $$c -le 5 ] && \
([ ! -e "$(TMPFILE)" ] || [ "`cat "$(TMPFILE)"`" != "SECOND" ]); do \
c=$$(($$c+1)); \
sleep 0.1; \
done; \
rm -f "$(TMPFILE)"; \
if [ $$c -gt 5 ]; then exit 10; else exit 0; fi
SECOND: rmtmpfile
@echo $@ > "$(TMPFILE)"
.PHONY: all FIRST SECOND rmtmpfile
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