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Reduce code size of mandatory runtime

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This change reduces o/tiny/examples/life from 44kb to 24kb in size since
it avoids linking mmap() when unnecessary. This is important, to helping
cosmo not completely lose touch with its roots.
This commit is contained in:
Justine Tunney 2024-07-04 02:50:20 -07:00
parent fdab49b30e
commit 15ea0524b3
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GPG key ID: BE714B4575D6E328
17 changed files with 164 additions and 163 deletions
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14
third_party/nsync/common.c vendored
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@ -181,7 +181,7 @@ static void *nsync_malloc (size_t size) {
static struct Dll *free_waiters = NULL;
/* free_waiters points to a doubly-linked list of free waiter structs. */
nsync_atomic_uint32_ free_waiters_mu; /* spinlock; protects free_waiters */
pthread_mutex_t nsync_waiters_mu = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
#define waiter_for_thread __get_tls()->tib_nsync
@ -196,9 +196,9 @@ void nsync_waiter_destroy (void *v) {
IGNORE_RACES_START ();
ASSERT ((w->flags & (WAITER_RESERVED|WAITER_IN_USE)) == WAITER_RESERVED);
w->flags &= ~WAITER_RESERVED;
nsync_spin_test_and_set_ (&free_waiters_mu, 1, 1, 0);
pthread_mutex_lock (&nsync_waiters_mu);
dll_make_first (&free_waiters, &w->nw.q);
ATM_STORE_REL (&free_waiters_mu, 0); /* release store */
pthread_mutex_unlock (&nsync_waiters_mu);
IGNORE_RACES_END ();
}
@ -212,13 +212,13 @@ waiter *nsync_waiter_new_ (void) {
w = tw;
if (w == NULL || (w->flags & (WAITER_RESERVED|WAITER_IN_USE)) != WAITER_RESERVED) {
w = NULL;
nsync_spin_test_and_set_ (&free_waiters_mu, 1, 1, 0);
pthread_mutex_lock (&nsync_waiters_mu);
q = dll_first (free_waiters);
if (q != NULL) { /* If free list is non-empty, dequeue an item. */
dll_remove (&free_waiters, q);
w = DLL_WAITER (q);
}
ATM_STORE_REL (&free_waiters_mu, 0); /* release store */
pthread_mutex_unlock (&nsync_waiters_mu);
if (w == NULL) { /* If free list was empty, allocate an item. */
w = (waiter *) nsync_malloc (sizeof (*w));
w->tag = WAITER_TAG;
@ -246,9 +246,9 @@ void nsync_waiter_free_ (waiter *w) {
ASSERT ((w->flags & WAITER_IN_USE) != 0);
w->flags &= ~WAITER_IN_USE;
if ((w->flags & WAITER_RESERVED) == 0) {
nsync_spin_test_and_set_ (&free_waiters_mu, 1, 1, 0);
pthread_mutex_lock (&nsync_waiters_mu);
dll_make_first (&free_waiters, &w->nw.q);
ATM_STORE_REL (&free_waiters_mu, 0); /* release store */
pthread_mutex_unlock (&nsync_waiters_mu);
if (w == waiter_for_thread)
waiter_for_thread = 0;
}