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Reduce stack virtual memory consumption on Linux

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Justine Tunney 2024-12-25 19:43:43 -08:00
parent cc8a9eb93c
commit 36e5861b0c
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GPG key ID: BE714B4575D6E328
31 changed files with 583 additions and 166 deletions
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17
libc/thread/pthread_attr_setstacksize.c
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@ -17,19 +17,28 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/errno.h"
#include "libc/limits.h"
#include "libc/thread/thread.h"
/**
* Defines minimum stack size for thread.
* Specifies minimum stack size for thread.
*
* On Linux, if you're not using `cosmocc -mtiny`, and you're not using
* cosmo_dlopen(), and guard size is nonzero, then `MAP_GROWSDOWN` will
* be used to create your stack memory. This helps minimize virtual
* memory consumption. Please note this is only possible if `stacksize`
* is no larger than the current `RLIMIT_STACK`, otherwise the runtime
* will map your stack using plain old mmap().
*
* Non-custom stacks may be recycled by the cosmo runtime. You can
* control this behavior by calling cosmo_stack_setmaxstacks(). It's
* useful for both tuning performance and hardening security. See also
* pthread_attr_setguardsize() which is important for security too.
*
* @param stacksize contains stack size in bytes
* @return 0 on success, or errno on error
* @raise EINVAL if `stacksize` is less than `PTHREAD_STACK_MIN`
*/
errno_t pthread_attr_setstacksize(pthread_attr_t *a, size_t stacksize) {
if (stacksize > INT_MAX)
return EINVAL;
if (stacksize < PTHREAD_STACK_MIN)
return EINVAL;
a->__stacksize = stacksize;