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libcglue: clarify resetting newlib stdio init in __locks_init #357

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libcglue: clarify resetting newlib stdio init in __locks_init #357

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10 changes: 10 additions & 0 deletions src/libcglue/lock.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <sys/lock.h>
#include <reent.h>
#include <pspthreadman.h>

// Structure representing the lock
Expand Down Expand Up @@ -164,6 +165,15 @@ extern struct __lock __lock___arc4random_mutex;

void __locks_init()
{
/* Clear newlib's stdio init marker so `__sinit` will reinitialize
* FILE structures and their associated locks the next time stdio
* is used for this reentrancy structure.
*
* Setting `_REENT_CLEANUP(_REENT)` to NULL forces newlib to treat
* stdio as uninitialized, ensuring locks are created deterministically.
*/
_REENT_CLEANUP(_REENT) = NULL;

_LOCK_T lock_malloc = &__lock___malloc_recursive_mutex;
_LOCK_T lock_atexit = &__lock___atexit_recursive_mutex;
_LOCK_T lock_quick_exit = &__lock___at_quick_exit_mutex;
Expand Down