[PATCH 3/9] run_processes_parallel: Add output to tracing messages

[Stefan Beller <sbeller@google.com>]

This commit serves 2 purposes. First this may help the user who
tries to diagnose intermixed process calls. Second this may be used
in a later patch for testing. As the output of a command should not
change visibly except for going faster, grepping for the trace output
seems like a viable testing strategy.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 run-command.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/run-command.c b/run-command.c
index 1fbd286..9ac2df5 100644
--- a/run-command.c
+++ b/run-command.c
@@ -949,6 +949,9 @@ static struct parallel_processes *pp_init(int n,
 		n = online_cpus();
 
 	pp->max_processes = n;
+
+	trace_printf("run_processes_parallel: preparing to run up to %d children in parallel", n);
+
 	pp->data = data;
 	if (!get_next_task)
 		die("BUG: you need to specify a get_next_task function");
@@ -978,6 +981,7 @@ static void pp_cleanup(struct parallel_processes *pp)
 {
 	int i;
 
+	trace_printf("run_processes_parallel: parallel processing done");
 	for (i = 0; i < pp->max_processes; i++) {
 		strbuf_release(&pp->children[i].err);
 		child_process_deinit(&pp->children[i].process);
-- 
2.5.0.283.g1a79c94.dirty