#ifdef LISP_FEATURE_MACH_EXCEPTION_HANDLER
#include <mach/mach.h>
+#include <libkern/OSAtomic.h>
+#include <stdlib.h>
+#endif
+
+#if defined(LISP_FEATURE_SB_WTIMER)
+# include <sys/types.h>
+# include <sys/event.h>
+# include <sys/time.h>
#endif
char *
return mach_exception_handling_thread;
}
+struct exception_port_record
+{
+ struct thread * thread;
+ struct exception_port_record * next;
+};
+
+static OSQueueHead free_records = OS_ATOMIC_QUEUE_INIT;
+
+/* We can't depend on arbitrary addresses to be accepted as mach port
+ * names, particularly not on 64-bit platforms. Instead, we allocate
+ * records that point to the thread struct, and loop until one is accepted
+ * as a port name.
+ *
+ * Threads are mapped to exception ports with a slot in the thread struct,
+ * and exception ports are casted to records that point to the corresponding
+ * thread.
+ *
+ * The lock-free free-list above is used as a cheap fast path.
+ */
+static mach_port_t
+find_receive_port(struct thread * thread)
+{
+ mach_port_t ret;
+ struct exception_port_record * curr, * to_free = NULL;
+ unsigned long i;
+ for (i = 1;; i++) {
+ curr = OSAtomicDequeue(&free_records, offsetof(struct exception_port_record, next));
+ if (curr == NULL) {
+ curr = calloc(1, sizeof(struct exception_port_record));
+ if (curr == NULL)
+ lose("unable to allocate exception_port_record\n");
+ }
+#ifdef LISP_FEATURE_X86_64
+ if ((mach_port_t)curr != (unsigned long)curr)
+ goto skip;
+#endif
+
+ if (mach_port_allocate_name(current_mach_task,
+ MACH_PORT_RIGHT_RECEIVE,
+ (mach_port_t)curr))
+ goto skip;
+ curr->thread = thread;
+ ret = (mach_port_t)curr;
+ break;
+ skip:
+ curr->next = to_free;
+ to_free = curr;
+ if ((i % 1024) == 0)
+ FSHOW((stderr, "Looped %lu times trying to allocate an exception port\n"));
+ }
+ while (to_free != NULL) {
+ struct exception_port_record * current = to_free;
+ to_free = to_free->next;
+ free(current);
+ }
+
+ FSHOW((stderr, "Allocated exception port %x for thread %p\n", ret, thread));
+
+ return ret;
+}
+
/* tell the kernel that we want EXC_BAD_ACCESS exceptions sent to the
exception port (which is being listened to do by the mach
exception handling thread). */
kern_return_t
-mach_thread_init(mach_port_t thread_exception_port)
+mach_lisp_thread_init(struct thread * thread)
{
kern_return_t ret;
- mach_port_t current_mach_thread;
+ mach_port_t current_mach_thread, thread_exception_port;
/* allocate a named port for the thread */
- FSHOW((stderr, "Allocating mach port %x\n", thread_exception_port));
- ret = mach_port_allocate_name(current_mach_task,
- MACH_PORT_RIGHT_RECEIVE,
- thread_exception_port);
- if (ret) {
- lose("mach_port_allocate_name failed with return_code %d\n", ret);
- }
+ thread_exception_port
+ = thread->mach_port_name
+ = find_receive_port(thread);
/* establish the right for the thread_exception_port to send messages */
ret = mach_port_insert_right(current_mach_task,
return ret;
}
+kern_return_t
+mach_lisp_thread_destroy(struct thread *thread) {
+ kern_return_t ret;
+ mach_port_t port = thread->mach_port_name;
+ FSHOW((stderr, "Deallocating mach port %x\n", port));
+ mach_port_move_member(current_mach_task, port, MACH_PORT_NULL);
+ mach_port_deallocate(current_mach_task, port);
+
+ ret = mach_port_destroy(current_mach_task, port);
+ ((struct exception_port_record*)port)->thread = NULL;
+ OSAtomicEnqueue(&free_records, (void*)port, offsetof(struct exception_port_record, next));
+
+ return ret;
+}
+
void
setup_mach_exceptions() {
setup_mach_exception_handling_thread();
- mach_thread_init(THREAD_STRUCT_TO_EXCEPTION_PORT(all_threads));
+ mach_lisp_thread_init(all_threads);
}
pid_t
return pid;
}
}
+#endif
void darwin_init(void)
{
+#ifdef LISP_FEATURE_MACH_EXCEPTION_HANDLER
setup_mach_exception_handling_thread();
+#endif
}
-#endif
#ifdef LISP_FEATURE_SB_THREAD
}
#endif
+
+#if defined(LISP_FEATURE_SB_WTIMER)
+
+# error Completely untested. Go ahead! Remove this line, try your luck!
+
+/*
+ * Waitable timer implementation for the safepoint-based (SIGALRM-free)
+ * timer facility using kqueue.
+ *
+ * Unlike FreeBSD with its ms (!) timer resolution, Darwin supports ns
+ * timer resolution -- or at least it pretends to do so on the API
+ * level (?). To use it, we need the *64 versions of the functions and
+ * structures.
+ *
+ * Unfortunately, I don't run Darwin, and can't test this code, so it's
+ * just a hopeful translation from FreeBSD.
+ */
+
+int
+os_create_wtimer()
+{
+ int kq = kqueue();
+ if (kq == -1)
+ lose("os_create_wtimer: kqueue");
+ return kq;
+}
+
+int
+os_wait_for_wtimer(int kq)
+{
+ struct kevent64_s ev;
+ int n;
+ if ( (n = kevent64(kq, 0, 0, &ev, 1, 0, 0)) == -1) {
+ if (errno != EINTR)
+ lose("os_wtimer_listen failed");
+ n = 0;
+ }
+ return n != 1;
+}
+
+void
+os_close_wtimer(int kq)
+{
+ if (close(kq) == -1)
+ lose("os_close_wtimer failed");
+}
+
+void
+os_set_wtimer(int kq, int sec, int nsec)
+{
+ int64_t nsec = ((int64_t) sec) * 1000000000 + (int64_t) nsec;
+
+ struct kevent64_s ev;
+ EV_SET64(&ev, 1, EVFILT_TIMER, EV_ADD|EV_ENABLE|EV_ONESHOT, NOTE_NSECONDS,
+ nsec, 0, 0, 0);
+ if (kevent64(kq, &ev, 1, 0, 0, 0, 0) == -1)
+ perror("os_set_wtimer: kevent");
+}
+
+void
+os_cancel_wtimer(int kq)
+{
+ struct kevent64_s ev;
+ EV_SET64(&ev, 1, EVFILT_TIMER, EV_DISABLE, 0, 0, 0, 0, 0);
+ if (kevent64(kq, &ev, 1, 0, 0, 0, 0) == -1 && errno != ENOENT)
+ perror("os_cancel_wtimer: kevent");
+}
+#endif
projects / sbcl.git / blobdiff