diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/pc386/console/fb_cirrus.c')
| -rw-r--r-- | c/src/lib/libbsp/i386/pc386/console/fb_cirrus.c | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/c/src/lib/libbsp/i386/pc386/console/fb_cirrus.c b/c/src/lib/libbsp/i386/pc386/console/fb_cirrus.c index 1b311a18bc..15d36a3a38 100644 --- a/c/src/lib/libbsp/i386/pc386/console/fb_cirrus.c +++ b/c/src/lib/libbsp/i386/pc386/console/fb_cirrus.c @@ -27,9 +27,10 @@ #include <rtems/fb.h> #include <rtems/framebuffer.h> +#include <rtems/score/atomic.h> -/* mutex to limit driver to protect against multiple opens */ -static pthread_mutex_t cirrus_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 @@ -332,6 +333,8 @@ frame_buffer_initialize( rtems_fatal_error_occurred( status ); } + _Atomic_Flag_clear(&driver_mutex, ATOMIC_ORDER_RELEASE); + return RTEMS_SUCCESSFUL; } } @@ -591,8 +594,8 @@ frame_buffer_open( int r; uint32_t smem_start, regs_start; - if (pthread_mutex_trylock(&cirrus_mutex)!= 0){ - printk( "FB_CIRRUS could not lock cirrus_mutex\n" ); + if (_Atomic_Flag_test_and_set(&driver_mutex, ATOMIC_ORDER_ACQUIRE) != 0 ) { + printk( "FB_CIRRUS could not lock driver_mutex\n" ); return RTEMS_UNSATISFIED; } @@ -662,19 +665,17 @@ frame_buffer_close( void *arg ) { - if (pthread_mutex_unlock(&cirrus_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() */ + _Atomic_Flag_clear(&driver_mutex, ATOMIC_ORDER_RELEASE); - /* VGA text mode */ - fb_cirrus_write_gdc_reg(&cirrus_board_info, 0x06, 0x00); + /* 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_CIRRUS: close called.\n" ); - return RTEMS_SUCCESSFUL; - } + /* VGA text mode */ + fb_cirrus_write_gdc_reg(&cirrus_board_info, 0x06, 0x00); - return RTEMS_UNSATISFIED; + printk( "FB_CIRRUS: close called.\n" ); + return RTEMS_SUCCESSFUL; } /* |