168 lines
3.9 KiB
Makefile
168 lines
3.9 KiB
Makefile
# $NetBSD: locking.mk,v 1.1 2020/05/10 06:52:50 rillig Exp $
|
|
#
|
|
# User-settable variables:
|
|
#
|
|
# WRKDIR_LOCKTYPE
|
|
# The type of locking used for WRKDIR.
|
|
#
|
|
# Possible values: none once sleep
|
|
# Default value: none
|
|
# Recommended: once
|
|
#
|
|
# LOCALBASE_LOCKTYPE
|
|
# The type of locking used for LOCALBASE.
|
|
#
|
|
# Possible values: none once sleep
|
|
# Default value: none
|
|
# Recommended: sleep
|
|
#
|
|
# See also: PKGSRC_LOCKTYPE.
|
|
# Keywords: lock locking parallel
|
|
|
|
# This file provides the following .USE targets:
|
|
#
|
|
# acquire-lock
|
|
# Acquires a coarse-grained lock in WRKDIR.
|
|
#
|
|
# release-lock
|
|
# Releases the lock in WRKDIR.
|
|
#
|
|
# acquire-localbase-lock
|
|
# Acquires a coarse-grained lock in LOCALBASE.
|
|
#
|
|
# release-localbase-lock
|
|
# Releases the lock in LOCALBASE.
|
|
#
|
|
|
|
WRKDIR_LOCKTYPE?= ${PKGSRC_LOCKTYPE}
|
|
LOCALBASE_LOCKTYPE?= ${PKGSRC_LOCKTYPE}
|
|
|
|
_WRKDIR_LOCKFILE= ${WRKDIR}/.lockfile
|
|
_LOCALBASE_LOCKFILE= ${LOCALBASE}/.lockfile
|
|
_LOCKVARS= WRKDIR_LOCKTYPE LOCALBASE_LOCKTYPE
|
|
|
|
#
|
|
# Sanity checks.
|
|
#
|
|
|
|
.for v in ${_LOCKVARS}
|
|
_OK= no
|
|
. for t in none once sleep
|
|
. if ${${v}} == "${t}"
|
|
_OK= yes
|
|
. endif
|
|
. endfor
|
|
. if ${_OK} != "yes"
|
|
PKG_FAIL_REASON+= "[locking.mk] ${v} must be one of { none once sleep }, not ${${v}}."
|
|
. endif
|
|
.endfor
|
|
|
|
#
|
|
# Needed tools.
|
|
#
|
|
|
|
.for v in ${_LOCKVARS}
|
|
. if ${${v}} != "none"
|
|
USE_TOOLS+= shlock
|
|
. endif
|
|
. if ${${v}} == "sleep"
|
|
USE_TOOLS+= sleep
|
|
. endif
|
|
.endfor
|
|
|
|
#
|
|
# The commands.
|
|
#
|
|
|
|
_CHECK_IF_SHLOCK_IS_AVAILABLE_CMD= \
|
|
[ "${PKGPATH}" != "pkgtools/shlock" ] || exit 0; \
|
|
[ -x ${SHLOCK:Q}"" ] || { \
|
|
${ERROR_MSG} "[locking.mk] shlock is not installed."; \
|
|
${ERROR_MSG} "[locking.mk] Please \"(cd ../../pkgtools/shlock && ${MAKE} install)\"."; \
|
|
exit 1; \
|
|
}
|
|
|
|
_ACQUIRE_LOCK_CMD= \
|
|
${_CHECK_IF_SHLOCK_IS_AVAILABLE_CMD}; \
|
|
ppid=`${PS} -p $$$$ -o ppid | ${AWK} 'NR == 2 { print $$1 }'`; \
|
|
if [ -z "$$ppid" ]; then \
|
|
${ERROR_MSG} "No parent process ID found."; \
|
|
exit 1; \
|
|
fi; \
|
|
while :; do \
|
|
if [ -f /var/run/dmesg.boot -a -f "$$lockfile" ]; then \
|
|
rebooted=`${FIND} /var/run/dmesg.boot -newer "$$lockfile" -print`; \
|
|
if [ "$$rebooted" ]; then \
|
|
${STEP_MSG} "Removing stale $$lockfile"; \
|
|
${RM} -f "$$lockfile"; \
|
|
fi; \
|
|
fi; \
|
|
lockdir=`echo "$$lockfile" | sed "s,/[^/]*\$$,,"`; \
|
|
${MKDIR} "$$lockdir"; \
|
|
if ${SHLOCK} -f "$$lockfile" -p "$$ppid"; then \
|
|
break; \
|
|
fi; \
|
|
lockpid=`${CAT} "$$lockfile"`; \
|
|
case "$$locktype" in \
|
|
once) ${FAIL_MSG} "Lock ${.TARGET} is held by pid $$lockpid" ;; \
|
|
sleep) ${STEP_MSG} "Lock ${.TARGET} is held by pid $$lockpid"; \
|
|
${SLEEP} ${PKGSRC_SLEEPSECS}; \
|
|
;; \
|
|
esac; \
|
|
done;
|
|
.if defined(PKG_VERBOSE)
|
|
_ACQUIRE_LOCK_CMD+= \
|
|
lockpid=`${CAT} "$$lockfile"`; \
|
|
${STEP_MSG} "Lock $$lockfile acquired for \`\`${.TARGET:S/^acquire-//:S/-lock$//}'' on behalf of process $$lockpid";
|
|
.endif
|
|
|
|
_RELEASE_LOCK_CMD= # nothing
|
|
.if defined(PKG_VERBOSE)
|
|
_RELEASE_LOCK_CMD+= \
|
|
lockpid=`${CAT} "$$lockfile"`; \
|
|
${STEP_MSG} "Lock $$lockfile released for \`\`${.TARGET:S/^release-//:S/-lock$//}'' on behalf of process $$lockpid";
|
|
.endif
|
|
_RELEASE_LOCK_CMD+= \
|
|
${RM} -f "$$lockfile"
|
|
|
|
#
|
|
# The targets.
|
|
#
|
|
|
|
.PHONY: acquire-lock release-lock
|
|
.PHONY: acquire-localbase-lock release-localbase-lock
|
|
|
|
.if ${LOCALBASE_LOCKTYPE} == "none"
|
|
acquire-localbase-lock release-localbase-lock: .USE
|
|
@${DO_NADA}
|
|
.else
|
|
acquire-localbase-lock: .USE
|
|
${RUN} \
|
|
lockfile=${_LOCALBASE_LOCKFILE}; \
|
|
locktype=${LOCALBASE_LOCKTYPE}; \
|
|
${_ACQUIRE_LOCK_CMD}
|
|
|
|
release-localbase-lock: .USE
|
|
${RUN} \
|
|
lockfile=${_LOCALBASE_LOCKFILE}; \
|
|
locktype=${LOCALBASE_LOCKTYPE}; \
|
|
${_RELEASE_LOCK_CMD}
|
|
.endif
|
|
|
|
.if ${WRKDIR_LOCKTYPE} == "none"
|
|
acquire-lock release-lock: .USE
|
|
@${DO_NADA}
|
|
.else
|
|
acquire-lock: .USE
|
|
${RUN} \
|
|
lockfile=${_WRKDIR_LOCKFILE}; \
|
|
locktype=${WRKDIR_LOCKTYPE}; \
|
|
${_ACQUIRE_LOCK_CMD}
|
|
|
|
release-lock: .USE
|
|
${RUN} \
|
|
lockfile=${_WRKDIR_LOCKFILE}; \
|
|
locktype=${WRKDIR_LOCKTYPE}; \
|
|
${_RELEASE_LOCK_CMD}
|
|
|
|
.endif
|