diff options
Diffstat (limited to 'nuttx/graphics/nxconsole/nxcon_internal.h')
| -rw-r--r-- | nuttx/graphics/nxconsole/nxcon_internal.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/nuttx/graphics/nxconsole/nxcon_internal.h b/nuttx/graphics/nxconsole/nxcon_internal.h index 963511b29..62ae71705 100644 --- a/nuttx/graphics/nxconsole/nxcon_internal.h +++ b/nuttx/graphics/nxconsole/nxcon_internal.h @@ -70,6 +70,10 @@ #define NX_DEVNAME_FORMAT "/dev/nxcon%d" #define NX_DEVNAME_SIZE 16 +/* Semaphore protection */ + +#define NO_HOLDER (pid_t)-1 + /**************************************************************************** * Public Types ****************************************************************************/ @@ -126,6 +130,9 @@ struct nxcon_state_s FAR struct nxcon_window_s wndo; /* Describes the window and font */ NXHANDLE font; /* The current font handle */ sem_t exclsem; /* Forces mutually exclusive access */ +#ifdef CONFIG_DEBUG + pid_t holder; /* Deadlock avoidance */ +#endif struct nxgl_point_s fpos; /* Next display position */ uint16_t maxchars; /* Size of the bm[] array */ @@ -165,6 +172,16 @@ extern const struct file_operations g_nxcon_drvrops; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ +/* Semaphore helpers */ + +#ifdef CONFIG_DEBUG +int nxcon_semwait(FAR struct nxcon_state_s *priv); +int nxcon_sempost(FAR struct nxcon_state_s *priv); +#else +# define nxcon_semwait(p) sem_wait(&p->exclsem); +# define nxcon_sempost(p) sem_post(&p->exclsem); +#endif + /* Common device registration */ FAR struct nxcon_state_s *nxcon_register(NXCONSOLE handle, |