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Add macro for locking of recipe commands.

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23708 3c298f89-4303-0410-b956-a3cf2f4a3e73
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mb 2010-10-29 14:53:16 +00:00
parent 0ca3c6b768
commit 4af18f4363
1 changed files with 10 additions and 0 deletions
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10
rules.mk
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@ -249,6 +249,16 @@ define include_mk
$(eval -include $(if $(DUMP),,$(STAGING_DIR)/mk/$(strip $(1))))
endef
# Execute commands under flock
# $(1) => The shell expression.
# $(2) => The lock name. If not given, the global lock will be used.
# $(3) => The filedescriptor used for the lock. Defaults to 1023.
define locked
( $(STAGING_DIR_HOST)/bin/flock -x $(if $(3),$(3),1023) && \
$(1) \
) $(if $(3),$(strip $(3)),1023)>$(TMP_DIR)/.$(if $(2),$(strip $(2)),global).flock
endef
# file extension
ext=$(word $(words $(subst ., ,$(1))),$(subst ., ,$(1)))