uvos/libeismultiplexer
1
0
Fork 0
Code Issues Pull requests Actions Packages Projects Releases Wiki Activity

usb_shm: correct refcounting

Browse source
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
Show stats Download patch file Download diff file Expand all files Collapse all files

6
eismultiplexer.c
View file

@ -40,10 +40,6 @@ int eismultiplexer_connect(struct eismultiplexer* muliplexer, uint16_t serial)
muliplexer->priv = malloc(sizeof(*muliplexer->priv));
if(!muliplexer->priv)
return -1;
ret = usbshm_init(muliplexer->priv);
if(ret)
return -2;
unsigned char serialStr[5];
snprintf((char*)serialStr, sizeof(serialStr), "%04hu", serial);
@ -112,7 +108,7 @@ uint16_t eismultiplexer_read_eeprom(struct eismultiplexer* muliplexer, uint16_t
void eismultiplexer_disconnect(struct eismultiplexer* muliplexer)
{
usbshm_distroy(muliplexer->priv);
usbshm_close(muliplexer->priv);
free(muliplexer->priv);
muliplexer->priv = NULL;
}

45
usbshm.c
View file

@ -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);

6
usbshm.h
View file

@ -48,12 +48,10 @@ struct usbshm {
pthread_mutex_t* mutex;
};
void usbshm_distroy(struct usbshm* instance);
int usbshm_init(struct usbshm* instance);
int usbshm_open(struct usbshm* instance, int vendorID, int productID, const unsigned char* serial);
void usbshm_close(struct usbshm* instance);
bool usbshm_is_open(struct usbshm* instance);
void usbshm_reset(struct usbshm* instance);