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spawn: allow zero stacksize/priority to use binary loader defaults

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posix_spawnattr_init() no longer pre-fills attr->stacksize and
attr->priority (it leaves them zero, as memset already does).  When a
caller does not set them, the binary loader supplies them from the
loaded ELF (binp->stacksize / binp->priority, parsed from the nx_*
symbols), and nxtask_spawn_exec() falls back to the parent priority and
CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE for the posix_spawn() function-task
path.

This lets an application's stack size and priority embedded as ELF
symbols actually drive the spawned task, instead of being overridden by
the spawnattr defaults.

Signed-off-by: anjiahao <anjiahao@xiaomi.com>
This commit is contained in:
anjiahao 2026-07-15 17:19:12 +08:00 • committed by Alan C. Assis
parent 0178ceab19
commit 745a6e53a4
2 changed files with 29 additions and 8 deletions
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20
sched/task/task_spawn.c
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@ -219,6 +219,26 @@ static int nxtask_spawn_exec(FAR pid_t *pidp, FAR const char *name,
stacksize = CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE;
}
/* A zero priority/stacksize means "use the default": inherit the parent
* task's priority and fall back to CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE.
* This lets posix_spawnattr_init() leave these fields zero so that the
* binary loader can supply them from the loaded ELF (binp->priority /
* binp->stacksize) instead.
*/
if (priority == 0)
{
struct sched_param param;
nxsched_get_param(0, &param);
priority = param.sched_priority;
}
if (stacksize == 0)
{
stacksize = CONFIG_POSIX_SPAWN_DEFAULT_STACKSIZE;
}
/* Start the task */
pid = nxtask_spawn_create(name, priority, stackaddr,