CODEWITHSUNDEEP
makefile
07_05_GuyT
07_05_GuyT

Reputation: 2887

Execute processes in parallel, wait and execute the others

I use the following code to execute targets in parallel. Now what I want that it will work in parallel but there is some targets that need to be executed at the end, like wait for 3 processes that run in parallel to finish and then execute another 2 processes. How can I do that?

For example here is pack and cleanup to run after module1 and module2 will run in parallel.

NPROCS = $(shell sysctl hw.ncpu  | grep -o '[0-9]\+')
MAKEFLAGS += -j$(NPROCS)
all: module1 module2

.PHONY: module1
module1:
    @echo "run module 1"
    DIR=$(PWD)
    @echo $(DIR)

.PHONY: module2
module2:
    @echo "run module2”
.PHONY:
pack:
   pack $(DIR)
cleanup: 
    gbt clean $(DIR)

Upvotes: 1

Views: 467

Answers (1)

Biffen
Biffen

Reputation: 6351

This is what prerequisites, one of make’s great strengths, are for.

Change:

pack:

↓

pack: module1 module2

Which tells make that the pack target has two prerequisites; module1 and module2.

This means make won’t run pack until both module1 and module2 have finished running. Whether they run in parallel won’t make a difference.

If you have a lot of prerequisites, you can put them in a macro, e.g:

modules = module1 module2 …

pack: $(modules)

Upvotes: 1

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