#                                                                    -*-perl-*-

$description = "Test parallelism (-j) option.";


$details = "This test creates a makefile with two double-colon default
rules.  The first rule has a series of sleep and echo commands
intended to run in series.  The second and third have just an
echo statement.  When make is called in this test, it is given
the -j option with a value of 4.  This tells make that it may
start up to four jobs simultaneously.  In this case, since the
first command is a sleep command, the output of the second
and third commands will appear before the first if indeed
make is running all of these commands in parallel.";

if (!$parallel_jobs) {
  return -1;
}

if ($vos) {
  $delete_command = "delete_file -no_ask";
  $sleep_command = "sleep -seconds";
}
else {
  $delete_command = "rm -f";
  $sleep_command = "sleep";
}


run_make_test("
all : def_1 def_2 def_3
def_1 : ; \@echo ONE; $sleep_command 3 ; echo TWO
def_2 : ; \@$sleep_command 2 ; echo THREE
def_3 : ; \@$sleep_command 1 ; echo FOUR",
              '-j4', "ONE\nFOUR\nTHREE\nTWO");

# Test parallelism with included files.  Here we sleep/echo while
# building the included files, to test that they are being built in
# parallel.
run_make_test("
all: 1 2; \@echo success
-include 1.inc 2.inc
1.inc: ; \@echo ONE.inc; $sleep_command 2; echo TWO.inc; echo '1: ; \@echo ONE; $sleep_command 2; echo TWO' > \$\@
2.inc: ; \@$sleep_command 1; echo THREE.inc; echo '2: ; \@$sleep_command 1; echo THREE' > \$\@",
              "-j4",
              "ONE.inc\nTHREE.inc\nTWO.inc\nONE\nTHREE\nTWO\nsuccess\n");

unlink('1.inc', '2.inc');


# Test parallelism with included files--this time recurse first and make
# sure the jobserver works.
run_make_test("
recurse: ; \@\$(MAKE) --no-print-directory -f #MAKEFILE# INC=yes all
all: 1 2; \@echo success

INC = no
ifeq (\$(INC),yes)
-include 1.inc 2.inc
endif

1.inc: ; \@echo ONE.inc; $sleep_command 2; echo TWO.inc; echo '1: ; \@echo ONE; $sleep_command 2; echo TWO' > \$\@
2.inc: ; \@$sleep_command 1; echo THREE.inc; echo '2: ; \@$sleep_command 1; echo THREE' > \$\@",
              "-j4",
              "ONE.inc\nTHREE.inc\nTWO.inc\nONE\nTHREE\nTWO\nsuccess\n");

unlink('1.inc', '2.inc');

# Grant Taylor reports a problem where tokens can be lost (not written back
# to the pipe when they should be): this happened when there is a $(shell ...)
# function in an exported recursive variable.  I added some code to check
# for this situation and print a message if it occurred.  This test used
# to trigger this code when I added it but no longer does after the fix.

run_make_test("
export HI = \$(shell \$(\$\@.CMD))
first.CMD = echo hi
second.CMD = $sleep_command 4; echo hi

.PHONY: all first second
all: first second

first second: ; \@echo \$\@; $sleep_command 1; echo \$\@",
              '-j2', "first\nfirst\nsecond\nsecond");

1;