aboutsummaryrefslogtreecommitdiff
path: root/vendor/github.com/karalabe/hid/libusb/libusb/os/threads_windows.c
diff options
context:
space:
mode:
Diffstat (limited to 'vendor/github.com/karalabe/hid/libusb/libusb/os/threads_windows.c')
-rw-r--r--vendor/github.com/karalabe/hid/libusb/libusb/os/threads_windows.c259
1 files changed, 259 insertions, 0 deletions
diff --git a/vendor/github.com/karalabe/hid/libusb/libusb/os/threads_windows.c b/vendor/github.com/karalabe/hid/libusb/libusb/os/threads_windows.c
new file mode 100644
index 0000000..7c2e52d
--- /dev/null
+++ b/vendor/github.com/karalabe/hid/libusb/libusb/os/threads_windows.c
@@ -0,0 +1,259 @@
+/*
+ * libusb synchronization on Microsoft Windows
+ *
+ * Copyright © 2010 Michael Plante <michael.plante@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <objbase.h>
+#include <errno.h>
+
+#include "libusbi.h"
+
+struct usbi_cond_perthread {
+ struct list_head list;
+ DWORD tid;
+ HANDLE event;
+};
+
+int usbi_mutex_static_lock(usbi_mutex_static_t *mutex)
+{
+ if (!mutex)
+ return EINVAL;
+ while (InterlockedExchange(mutex, 1) == 1)
+ SleepEx(0, TRUE);
+ return 0;
+}
+
+int usbi_mutex_static_unlock(usbi_mutex_static_t *mutex)
+{
+ if (!mutex)
+ return EINVAL;
+ InterlockedExchange(mutex, 0);
+ return 0;
+}
+
+int usbi_mutex_init(usbi_mutex_t *mutex)
+{
+ if (!mutex)
+ return EINVAL;
+ *mutex = CreateMutex(NULL, FALSE, NULL);
+ if (!*mutex)
+ return ENOMEM;
+ return 0;
+}
+
+int usbi_mutex_lock(usbi_mutex_t *mutex)
+{
+ DWORD result;
+
+ if (!mutex)
+ return EINVAL;
+ result = WaitForSingleObject(*mutex, INFINITE);
+ if (result == WAIT_OBJECT_0 || result == WAIT_ABANDONED)
+ return 0; // acquired (ToDo: check that abandoned is ok)
+ else
+ return EINVAL; // don't know how this would happen
+ // so don't know proper errno
+}
+
+int usbi_mutex_unlock(usbi_mutex_t *mutex)
+{
+ if (!mutex)
+ return EINVAL;
+ if (ReleaseMutex(*mutex))
+ return 0;
+ else
+ return EPERM;
+}
+
+int usbi_mutex_trylock(usbi_mutex_t *mutex)
+{
+ DWORD result;
+
+ if (!mutex)
+ return EINVAL;
+ result = WaitForSingleObject(*mutex, 0);
+ if (result == WAIT_OBJECT_0 || result == WAIT_ABANDONED)
+ return 0; // acquired (ToDo: check that abandoned is ok)
+ else if (result == WAIT_TIMEOUT)
+ return EBUSY;
+ else
+ return EINVAL; // don't know how this would happen
+ // so don't know proper error
+}
+
+int usbi_mutex_destroy(usbi_mutex_t *mutex)
+{
+ // It is not clear if CloseHandle failure is due to failure to unlock.
+ // If so, this should be errno=EBUSY.
+ if (!mutex || !CloseHandle(*mutex))
+ return EINVAL;
+ *mutex = NULL;
+ return 0;
+}
+
+int usbi_cond_init(usbi_cond_t *cond)
+{
+ if (!cond)
+ return EINVAL;
+ list_init(&cond->waiters);
+ list_init(&cond->not_waiting);
+ return 0;
+}
+
+int usbi_cond_destroy(usbi_cond_t *cond)
+{
+ // This assumes no one is using this anymore. The check MAY NOT BE safe.
+ struct usbi_cond_perthread *pos, *next_pos;
+
+ if(!cond)
+ return EINVAL;
+ if (!list_empty(&cond->waiters))
+ return EBUSY; // (!see above!)
+ list_for_each_entry_safe(pos, next_pos, &cond->not_waiting, list, struct usbi_cond_perthread) {
+ CloseHandle(pos->event);
+ list_del(&pos->list);
+ free(pos);
+ }
+ return 0;
+}
+
+int usbi_cond_broadcast(usbi_cond_t *cond)
+{
+ // Assumes mutex is locked; this is not in keeping with POSIX spec, but
+ // libusb does this anyway, so we simplify by not adding more sync
+ // primitives to the CV definition!
+ int fail = 0;
+ struct usbi_cond_perthread *pos;
+
+ if (!cond)
+ return EINVAL;
+ list_for_each_entry(pos, &cond->waiters, list, struct usbi_cond_perthread) {
+ if (!SetEvent(pos->event))
+ fail = 1;
+ }
+ // The wait function will remove its respective item from the list.
+ return fail ? EINVAL : 0;
+}
+
+__inline static int usbi_cond_intwait(usbi_cond_t *cond,
+ usbi_mutex_t *mutex, DWORD timeout_ms)
+{
+ struct usbi_cond_perthread *pos;
+ int r, found = 0;
+ DWORD r2, tid = GetCurrentThreadId();
+
+ if (!cond || !mutex)
+ return EINVAL;
+ list_for_each_entry(pos, &cond->not_waiting, list, struct usbi_cond_perthread) {
+ if(tid == pos->tid) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+ pos = calloc(1, sizeof(struct usbi_cond_perthread));
+ if (!pos)
+ return ENOMEM; // This errno is not POSIX-allowed.
+ pos->tid = tid;
+ pos->event = CreateEvent(NULL, FALSE, FALSE, NULL); // auto-reset.
+ if (!pos->event) {
+ free(pos);
+ return ENOMEM;
+ }
+ list_add(&pos->list, &cond->not_waiting);
+ }
+
+ list_del(&pos->list); // remove from not_waiting list.
+ list_add(&pos->list, &cond->waiters);
+
+ r = usbi_mutex_unlock(mutex);
+ if (r)
+ return r;
+
+ r2 = WaitForSingleObject(pos->event, timeout_ms);
+ r = usbi_mutex_lock(mutex);
+ if (r)
+ return r;
+
+ list_del(&pos->list);
+ list_add(&pos->list, &cond->not_waiting);
+
+ if (r2 == WAIT_OBJECT_0)
+ return 0;
+ else if (r2 == WAIT_TIMEOUT)
+ return ETIMEDOUT;
+ else
+ return EINVAL;
+}
+// N.B.: usbi_cond_*wait() can also return ENOMEM, even though pthread_cond_*wait cannot!
+int usbi_cond_wait(usbi_cond_t *cond, usbi_mutex_t *mutex)
+{
+ return usbi_cond_intwait(cond, mutex, INFINITE);
+}
+
+int usbi_cond_timedwait(usbi_cond_t *cond,
+ usbi_mutex_t *mutex, const struct timeval *tv)
+{
+ DWORD millis;
+
+ millis = (DWORD)(tv->tv_sec * 1000) + (tv->tv_usec / 1000);
+ /* round up to next millisecond */
+ if (tv->tv_usec % 1000)
+ millis++;
+ return usbi_cond_intwait(cond, mutex, millis);
+}
+
+int usbi_tls_key_create(usbi_tls_key_t *key)
+{
+ if (!key)
+ return EINVAL;
+ *key = TlsAlloc();
+ if (*key == TLS_OUT_OF_INDEXES)
+ return ENOMEM;
+ else
+ return 0;
+}
+
+void *usbi_tls_key_get(usbi_tls_key_t key)
+{
+ return TlsGetValue(key);
+}
+
+int usbi_tls_key_set(usbi_tls_key_t key, void *value)
+{
+ if (TlsSetValue(key, value))
+ return 0;
+ else
+ return EINVAL;
+}
+
+int usbi_tls_key_delete(usbi_tls_key_t key)
+{
+ if (TlsFree(key))
+ return 0;
+ else
+ return EINVAL;
+}
+
+int usbi_get_tid(void)
+{
+ return (int)GetCurrentThreadId();
+}