diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/pc386/console/fb_vga.c')
| -rw-r--r-- | c/src/lib/libbsp/i386/pc386/console/fb_vga.c | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/c/src/lib/libbsp/i386/pc386/console/fb_vga.c b/c/src/lib/libbsp/i386/pc386/console/fb_vga.c index 444f44d979..75ad56eb98 100644 --- a/c/src/lib/libbsp/i386/pc386/console/fb_vga.c +++ b/c/src/lib/libbsp/i386/pc386/console/fb_vga.c @@ -20,12 +20,14 @@ #include <rtems/fb.h> #include <rtems/framebuffer.h> +#include <rtems/score/atomic.h> + /* these routines are defined in vgainit.c.*/ extern void ega_hwinit( void ); extern void ega_hwterm( void ); -/* mutex attribure */ -pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; +/* flag to limit driver to protect against multiple opens */ +static Atomic_Flag driver_mutex; /* screen information for the VGA driver */ static struct fb_var_screeninfo fb_var = @@ -87,6 +89,8 @@ rtems_device_driver frame_buffer_initialize( rtems_fatal_error_occurred( status ); } + _Atomic_Flag_clear(&driver_mutex, ATOMIC_ORDER_RELEASE); + return RTEMS_SUCCESSFUL; } @@ -99,7 +103,7 @@ rtems_device_driver frame_buffer_open( void *arg ) { - if (pthread_mutex_trylock(&mutex)== 0){ + if (_Atomic_Flag_test_and_set(&driver_mutex, ATOMIC_ORDER_ACQUIRE) != 0 ) { /* restore previous state. for VGA this means return to text mode. * leave out if graphics hardware has been initialized in * frame_buffer_initialize() @@ -121,17 +125,13 @@ rtems_device_driver frame_buffer_close( void *arg ) { - if (pthread_mutex_unlock(&mutex) == 0){ - /* restore previous state. for VGA this means return to text mode. - * leave out if graphics hardware has been initialized in - * frame_buffer_initialize() */ - ega_hwterm(); - printk( "FBVGA close called.\n" ); - return RTEMS_SUCCESSFUL; - } - - return RTEMS_UNSATISFIED; -} + _Atomic_Flag_clear(&driver_mutex, ATOMIC_ORDER_RELEASE); + /* restore previous state. for VGA this means return to text mode. + * leave out if graphics hardware has been initialized in + * frame_buffer_initialize() */ + ega_hwterm(); + printk( "FBVGA close called.\n" ); + return RTEMS_SUCCESSFUL; /* * fbvga device driver READ entry point. |