diff options
Diffstat (limited to 'arch/um/os-Linux/time.c')
| -rw-r--r-- | arch/um/os-Linux/time.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c index 5939653f99ea..a16a0f484edc 100644 --- a/arch/um/os-Linux/time.c +++ b/arch/um/os-Linux/time.c @@ -12,6 +12,8 @@ #include "os.h" #include "user.h" +static int is_real_timer = 0; + int set_interval(int is_virtual) { int usec = 1000000/UM_HZ; @@ -39,12 +41,14 @@ void disable_timer(void) signal(SIGVTALRM, SIG_IGN); } -void switch_timers(int to_real) +int switch_timers(int to_real) { struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }}); - struct itimerval enable = ((struct itimerval) { { 0, 1000000/UM_HZ }, - { 0, 1000000/UM_HZ }}); - int old, new; + struct itimerval enable; + int old, new, old_type = is_real_timer; + + if(to_real == old_type) + return to_real; if (to_real) { old = ITIMER_VIRTUAL; @@ -55,10 +59,19 @@ void switch_timers(int to_real) new = ITIMER_VIRTUAL; } - if ((setitimer(old, &disable, NULL) < 0) || - (setitimer(new, &enable, NULL))) - printk(UM_KERN_ERR "switch_timers - setitimer failed, " + if (setitimer(old, &disable, &enable) < 0) + printk(UM_KERN_ERR "switch_timers - setitimer disable failed, " + "errno = %d\n", errno); + + if((enable.it_value.tv_sec == 0) && (enable.it_value.tv_usec == 0)) + enable.it_value = enable.it_interval; + + if (setitimer(new, &enable, NULL)) + printk(UM_KERN_ERR "switch_timers - setitimer enable failed, " "errno = %d\n", errno); + + is_real_timer = to_real; + return old_type; } unsigned long long os_nsecs(void) |