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      1  1.3  rillig # $NetBSD: dotwait.mk,v 1.3 2020/10/24 08:50:17 rillig Exp $
      2  1.1     apb 
      3  1.3  rillig THISMAKEFILE:=	${.PARSEDIR}/${.PARSEFILE}
      4  1.1     apb 
      5  1.3  rillig TESTS=	simple recursive shared cycle
      6  1.3  rillig PAUSE=	sleep 1
      7  1.1     apb 
      8  1.1     apb # Use a .for loop rather than dependencies here, to ensure
      9  1.1     apb # that the tests are run one by one, with parallelism
     10  1.1     apb # only within tests.
     11  1.1     apb # Ignore "--- target ---" lines printed by parallel make.
     12  1.1     apb all:
     13  1.1     apb .for t in ${TESTS}
     14  1.2     sjg 	@${.MAKE} -f ${THISMAKEFILE} -j4 $t 2>&1 | grep -v "^--- "
     15  1.1     apb .endfor
     16  1.1     apb 
     17  1.1     apb #
     18  1.1     apb # Within each test, the names of the sub-targets follow these
     19  1.1     apb # conventions:
     20  1.1     apb # * If it's expected that two or more targets may be made in parallel,
     21  1.1     apb #   then the target names will differ only in an alphabetic component
     22  1.1     apb #   such as ".a" or ".b".
     23  1.1     apb # * If it's expected that two or more targets should be made in sequence
     24  1.1     apb #   then the target names will differ in numeric components, such that
     25  1.1     apb #   lexical ordering of the target names matches the expected order
     26  1.1     apb #   in which the targets should be made.
     27  1.1     apb #
     28  1.1     apb # Targets may echo ${PARALLEL_TARG} to print a modified version
     29  1.1     apb # of their own name, in which alphabetic components like ".a" or ".b"
     30  1.1     apb # are converted to ".*".  Two targets that are expected to
     31  1.1     apb # be made in parallel will thus print the same strings, so that the
     32  1.1     apb # output is independent of the order in which these targets are made.
     33  1.1     apb #
     34  1.1     apb PARALLEL_TARG= ${.TARGET:C/\.[a-z]/.*/g:Q}
     35  1.1     apb .DEFAULT:
     36  1.1     apb 	@echo ${PARALLEL_TARG}; ${PAUSE}; echo ${PARALLEL_TARG}
     37  1.1     apb _ECHOUSE: .USE
     38  1.1     apb 	@echo ${PARALLEL_TARG}; ${PAUSE}; echo ${PARALLEL_TARG}
     39  1.1     apb 
     40  1.1     apb # simple: no recursion, no cycles
     41  1.1     apb simple: simple.1 .WAIT simple.2
     42  1.1     apb 
     43  1.1     apb # recursive: all children of the left hand side of the .WAIT
     44  1.1     apb # must be made before any child of the right hand side.
     45  1.1     apb recursive: recursive.1.99 .WAIT recursive.2.99
     46  1.1     apb recursive.1.99: recursive.1.1.a recursive.1.1.b _ECHOUSE
     47  1.1     apb recursive.2.99: recursive.2.1.a recursive.2.1.b _ECHOUSE
     48  1.1     apb 
     49  1.1     apb # shared: both shared.1.99 and shared.2.99 depend on shared.0.
     50  1.1     apb # shared.0 must be made first, even though it is a child of
     51  1.1     apb # the right hand side of the .WAIT.
     52  1.1     apb shared: shared.1.99 .WAIT shared.2.99
     53  1.1     apb shared.1.99: shared.0 _ECHOUSE
     54  1.1     apb shared.2.99: shared.2.1 shared.0 _ECHOUSE
     55  1.1     apb 
     56  1.1     apb # cycle: the cyclic dependency must not cause infinite recursion
     57  1.1     apb # leading to stack overflow and a crash.
     58  1.1     apb cycle: cycle.1.99 .WAIT cycle.2.99
     59  1.1     apb cycle.2.99: cycle.2.98 _ECHOUSE
     60  1.1     apb cycle.2.98: cycle.2.97 _ECHOUSE
     61  1.1     apb cycle.2.97: cycle.2.99 _ECHOUSE
     62