fusl/src/thread/pthread_setspecific.c

#include "pthread_impl.h"

int pthread_setspecific(pthread_key_t k, const void* x) {
  struct pthread* self = __pthread_self();
  /* Avoid unnecessary COW */
  if (self->tsd[k] != x) {
    self->tsd[k] = (void*)x;
    self->tsd_used = 1;
  }
  return 0;
}