diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/pc386/console/fb_vesa_rm.c')
| -rw-r--r-- | c/src/lib/libbsp/i386/pc386/console/fb_vesa_rm.c | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/c/src/lib/libbsp/i386/pc386/console/fb_vesa_rm.c b/c/src/lib/libbsp/i386/pc386/console/fb_vesa_rm.c index 33dfc354c4..b758564df1 100644 --- a/c/src/lib/libbsp/i386/pc386/console/fb_vesa_rm.c +++ b/c/src/lib/libbsp/i386/pc386/console/fb_vesa_rm.c @@ -55,6 +55,8 @@ #include <rtems/fb.h> #include <rtems/framebuffer.h> +#include <rtems/score/atomic.h> + #include <stdlib.h> #define FB_VESA_NAME "FB_VESA_RM" @@ -84,8 +86,8 @@ const char * const rtems_fb_default_mode; */ void vesa_realmode_bootup_init(void); -/* mutex for protection against multiple opens, when called frame_buffer_open */ -static pthread_mutex_t vesa_mutex = PTHREAD_MUTEX_INITIALIZER; +/* flag to limit driver to protect against multiple opens */ +static Atomic_Flag driver_mutex; /* screen information for the VGA driver * standard structures - from RTEMS fb interface @@ -840,9 +842,9 @@ frame_buffer_initialize( printk(FB_VESA_NAME " frame buffer -- driver initializing..\n" ); -/* - * Register the device. - */ + /* + * Register the device. + */ status = rtems_io_register_name(FRAMEBUFFER_DEVICE_0_NAME, major, 0); if (status != RTEMS_SUCCESSFUL) { @@ -851,6 +853,8 @@ frame_buffer_initialize( rtems_fatal_error_occurred( status ); } + _Atomic_Flag_clear(&driver_mutex, ATOMIC_ORDER_RELEASE); + return RTEMS_SUCCESSFUL; } @@ -866,7 +870,7 @@ frame_buffer_open( { printk( FB_VESA_NAME " open device\n" ); - if (pthread_mutex_trylock(&vesa_mutex) != 0) + if (_Atomic_Flag_test_and_set(&driver_mutex, ATOMIC_ORDER_ACQUIRE) != 0 ) { printk( FB_VESA_NAME " could not lock vesa_mutex\n" ); @@ -888,17 +892,13 @@ frame_buffer_close( ) { printk( FB_VESA_NAME " close device\n" ); - if (pthread_mutex_unlock(&vesa_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() */ - - printk(FB_VESA_NAME ": close called.\n" ); - return RTEMS_SUCCESSFUL; - } + _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() */ - return RTEMS_UNSATISFIED; + printk(FB_VESA_NAME ": close called.\n" ); + return RTEMS_SUCCESSFUL; } /* |