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Unified Diff: fusl/src/thread/pthread_key_create.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: fusl/src/thread/pthread_key_create.c
diff --git a/fusl/src/thread/pthread_key_create.c b/fusl/src/thread/pthread_key_create.c
new file mode 100644
index 0000000000000000000000000000000000000000..a78e507a6fc9a9708140e96929a6a572a4e27601
--- /dev/null
+++ b/fusl/src/thread/pthread_key_create.c
@@ -0,0 +1,56 @@
+#include "pthread_impl.h"
+
+volatile size_t __pthread_tsd_size = sizeof(void *) * PTHREAD_KEYS_MAX;
+void *__pthread_tsd_main[PTHREAD_KEYS_MAX] = { 0 };
+
+static void (*volatile keys[PTHREAD_KEYS_MAX])(void *);
+
+static void nodtor(void *dummy)
+{
+}
+
+int __pthread_key_create(pthread_key_t *k, void (*dtor)(void *))
+{
+ unsigned i = (uintptr_t)&k / 16 % PTHREAD_KEYS_MAX;
+ unsigned j = i;
+ pthread_t self = __pthread_self();
+
+ /* This can only happen in the main thread before
+ * pthread_create has been called. */
+ if (!self->tsd) self->tsd = __pthread_tsd_main;
+
+ if (!dtor) dtor = nodtor;
+ do {
+ if (!a_cas_p(keys+j, 0, (void *)dtor)) {
+ *k = j;
+ return 0;
+ }
+ } while ((j=(j+1)%PTHREAD_KEYS_MAX) != i);
+ return EAGAIN;
+}
+
+int __pthread_key_delete(pthread_key_t k)
+{
+ keys[k] = 0;
+ return 0;
+}
+
+void __pthread_tsd_run_dtors()
+{
+ pthread_t self = __pthread_self();
+ int i, j, not_finished = self->tsd_used;
+ for (j=0; not_finished && j<PTHREAD_DESTRUCTOR_ITERATIONS; j++) {
+ not_finished = 0;
+ for (i=0; i<PTHREAD_KEYS_MAX; i++) {
+ if (self->tsd[i] && keys[i]) {
+ void *tmp = self->tsd[i];
+ self->tsd[i] = 0;
+ keys[i](tmp);
+ not_finished = 1;
+ }
+ }
+ }
+}
+
+weak_alias(__pthread_key_delete, pthread_key_delete);
+weak_alias(__pthread_key_create, pthread_key_create);
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