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usb_shm: correct refcounting

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This commit is contained in:
Carl Philipp Klemm 2024-05-07 11:48:55 +02:00
parent c55b600d9e
commit a4b6335e57
3 changed files with 32 additions and 25 deletions
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45
usbshm.c
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@ -44,20 +44,7 @@
static int object_counter = 0;
static struct libusb_context* context = NULL;
void usbshm_distroy(struct usbshm* instance)
{
pthread_mutex_lock(instance->mutex);
libusb_close(instance->handle);
if(instance->serial)
free(instance->serial);
}
bool usbshm_is_open(struct usbshm* instance)
{
return instance->handle != NULL;
}
int usbshm_init(struct usbshm* instance)
static int usbshm_init(struct usbshm* instance)
{
int ret = 0;
if(object_counter == 0)
@ -76,12 +63,38 @@ int usbshm_init(struct usbshm* instance)
return ret < 0 ? USBSHM_ERROR_ERR : 0;
}
static void usbshm_exit(void)
{
if(--object_counter == 0)
{
libusb_exit(context);
context = NULL;
}
}
void usbshm_close(struct usbshm* instance)
{
pthread_mutex_lock(instance->mutex);
libusb_close(instance->handle);
if(instance->serial)
free(instance->serial);
usbshm_exit();
}
bool usbshm_is_open(struct usbshm* instance)
{
return instance->handle != NULL;
}
int usbshm_open(struct usbshm* instance, int vendorID, int productID, const unsigned char* serial)
{
if(instance->handle)
return USBSHM_ERROR_ALLREADY_CONNECTED;
if(!context)
return USBSHM_ERROR_NOT_CONNECTED;
int ret = usbshm_init(instance);
if(ret < 0)
return ret;
pthread_mutex_lock(instance->mutex);
libusb_device** list;
int count = libusb_get_device_list(context, &list);