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run-command.c: don't copy *_fn to "struct parallel_processes"

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The only remaining reason for copying the callbacks in the "struct
run_process_parallel_opts" over to the "struct parallel_processes" was
to avoid two if/else statements in case the "start_failure" and
"task_finished" callbacks were NULL.

Let's handle those cases in pp_start_one() and pp_collect_finished()
instead, and avoid the default_* stub functions, and the need to copy
this data around.

Organizing the code like this made more sense before the "struct
run_parallel_parallel_opts" existed, as we'd have needed to pass each
of these as a separate parameter.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2022-10-12 23:02:29 +02:00 committed by Junio C Hamano
parent e39c9de860
commit fa93951d79
1 changed files with 25 additions and 42 deletions
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67
run-command.c
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@ -1502,10 +1502,6 @@ struct parallel_processes {
const size_t max_processes;
size_t nr_processes;
get_next_task_fn get_next_task;
start_failure_fn start_failure;
task_finished_fn task_finished;
struct {
enum child_state state;
struct child_process process;
@ -1525,21 +1521,6 @@ struct parallel_processes {
struct strbuf buffered_output; /* of finished children */
};
static int default_start_failure(struct strbuf *out,
void *pp_cb,
void *pp_task_cb)
{
return 0;
}
static int default_task_finished(int result,
struct strbuf *out,
void *pp_cb,
void *pp_task_cb)
{
return 0;
}
static void kill_children(const struct parallel_processes *pp, int signo)
{
for (size_t i = 0; i < pp->max_processes; i++)
@ -1560,9 +1541,6 @@ static void pp_init(struct parallel_processes *pp,
const struct run_process_parallel_opts *opts)
{
const size_t n = opts->processes;
get_next_task_fn get_next_task = opts->get_next_task;
start_failure_fn start_failure = opts->start_failure;
task_finished_fn task_finished = opts->task_finished;
if (!n)
BUG("you must provide a non-zero number of processes!");
@ -1570,12 +1548,8 @@ static void pp_init(struct parallel_processes *pp,
trace_printf("run_processes_parallel: preparing to run up to %"PRIuMAX" tasks",
(uintmax_t)n);
if (!get_next_task)
if (!opts->get_next_task)
BUG("you need to specify a get_next_task function");
pp->get_next_task = get_next_task;
pp->start_failure = start_failure ? start_failure : default_start_failure;
pp->task_finished = task_finished ? task_finished : default_task_finished;
CALLOC_ARRAY(pp->children, n);
if (!pp->ungroup)
@ -1622,7 +1596,8 @@ static void pp_cleanup(struct parallel_processes *pp)
* <0 no new job was started, user wishes to shutdown early. Use negative code
* to signal the children.
*/
static int pp_start_one(struct parallel_processes *pp)
static int pp_start_one(struct parallel_processes *pp,
const struct run_process_parallel_opts *opts)
{
size_t i;
int code;
@ -1633,10 +1608,10 @@ static int pp_start_one(struct parallel_processes *pp)
if (i == pp->max_processes)
BUG("bookkeeping is hard");
code = pp->get_next_task(&pp->children[i].process,
pp->ungroup ? NULL : &pp->children[i].err,
pp->data,
&pp->children[i].data);
code = opts->get_next_task(&pp->children[i].process,
pp->ungroup ? NULL : &pp->children[i].err,
pp->data,
&pp->children[i].data);
if (!code) {
if (!pp->ungroup) {
strbuf_addbuf(&pp->buffered_output, &pp->children[i].err);
@ -1651,10 +1626,14 @@ static int pp_start_one(struct parallel_processes *pp)
pp->children[i].process.no_stdin = 1;
if (start_command(&pp->children[i].process)) {
code = pp->start_failure(pp->ungroup ? NULL :
&pp->children[i].err,
pp->data,
pp->children[i].data);
if (opts->start_failure)
code = opts->start_failure(pp->ungroup ? NULL :
&pp->children[i].err,
pp->data,
pp->children[i].data);
else
code = 0;
if (!pp->ungroup) {
strbuf_addbuf(&pp->buffered_output, &pp->children[i].err);
strbuf_reset(&pp->children[i].err);
@ -1709,7 +1688,8 @@ static void pp_output(const struct parallel_processes *pp)
}
}
static int pp_collect_finished(struct parallel_processes *pp)
static int pp_collect_finished(struct parallel_processes *pp,
const struct run_process_parallel_opts *opts)
{
int code;
size_t i, n = pp->max_processes;
@ -1724,9 +1704,12 @@ static int pp_collect_finished(struct parallel_processes *pp)
code = finish_command(&pp->children[i].process);
code = pp->task_finished(code, pp->ungroup ? NULL :
&pp->children[i].err, pp->data,
pp->children[i].data);
if (opts->task_finished)
code = opts->task_finished(code, pp->ungroup ? NULL :
&pp->children[i].err, pp->data,
pp->children[i].data);
else
code = 0;
if (code)
result = code;
@ -1795,7 +1778,7 @@ void run_processes_parallel(const struct run_process_parallel_opts *opts)
i < spawn_cap && !pp.shutdown &&
pp.nr_processes < pp.max_processes;
i++) {
code = pp_start_one(&pp);
code = pp_start_one(&pp, opts);
if (!code)
continue;
if (code < 0) {
@ -1813,7 +1796,7 @@ void run_processes_parallel(const struct run_process_parallel_opts *opts)
pp_buffer_stderr(&pp, output_timeout);
pp_output(&pp);
}
code = pp_collect_finished(&pp);
code = pp_collect_finished(&pp, opts);
if (code) {
pp.shutdown = 1;
if (code < 0)