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