| # -*- Makefile -*- | |
| # | |
| # AS A REGULAR M4M USER, YOU SHOULD NOT HAVE TO CHANGE ANYTHING IN THIS FILE | |
| # | |
| ################################################################################ | |
| # Auxiliary functions # | |
| ################################################################################ | |
| # lock/unlock | |
| # $(lock) creates a directory [email protected] to signal that the respective resource | |
| # is under construction. The lock is removed upon successful resource creation. | |
| # mkdir is defined as an atomic operation under POSIX, so directory creation | |
| # is a safe way of creating a lock. We create a file with 'owner' information, | |
| # so that we can check if the creating process is still | |
| # call as: $(lock) | |
| ifneq ($(filter n,${MAKEFLAGS}),n) | |
| define lock | |
| @mkdir -p ${@D}; | |
| @mkdir [email protected] | |
| @echo "Started at $(shell date) by process $(shell echo $$PPID) on host $(shell hostname)" \ | |
| > [email protected]/owner | |
| endef | |
| else | |
| lock := | |
| endif | |
| ifneq ($(filter n, ${MAKEFLAGS}),n) | |
| define unlock | |
| @rm [email protected]/owner; | |
| @rmdir [email protected] | |
| endef | |
| else | |
| unlock := | |
| endif | |
| # clear_variable allows us to clear a variable from within a function | |
| # the whitespace before and after appears to be necessary to ensure | |
| # things happen at the beginning of a new line, and there's a new line after | |
| define clear_variable | |
| $1 := | |
| endef | |
| define clear-ptables | |
| PTABLES := | |
| PTABLE_ENTRIES := | |
| endef | |
| define clear-dtables | |
| DTABLES := | |
| DTABLE_ENTRIES := | |
| endef | |
| define clear-lmodels | |
| LMODELS := | |
| LMODEL_ENTRIES := | |
| endef | |
| clear-locks: | $(shell find -L -type d -name '*.lock') | |
| rm -rf $| | |