diff options
Diffstat (limited to 'include/linux/posix-timers.h')
| -rw-r--r-- | include/linux/posix-timers.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h index 79a1cea7f6ed..88b9256169f8 100644 --- a/include/linux/posix-timers.h +++ b/include/linux/posix-timers.h @@ -18,6 +18,17 @@ struct cpu_timer_list { int firing; }; +/* + * Bit fields within a clockid: + * + * The most significant 29 bits hold either a pid or a file descriptor. + * + * Bit 2 indicates whether a cpu clock refers to a thread or a process. + * + * Bits 1 and 0 give the type: PROF=0, VIRT=1, SCHED=2, or FD=3. + * + * A clockid is invalid if bits 2, 1, and 0 are all set. + */ #define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3)) #define CPUCLOCK_PERTHREAD(clock) \ (((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0) @@ -29,6 +40,8 @@ struct cpu_timer_list { #define CPUCLOCK_VIRT 1 #define CPUCLOCK_SCHED 2 #define CPUCLOCK_MAX 3 +#define CLOCKFD CPUCLOCK_MAX +#define CLOCKFD_MASK (CPUCLOCK_PERTHREAD_MASK|CPUCLOCK_CLOCK_MASK) #define MAKE_PROCESS_CPUCLOCK(pid, clock) \ ((~(clockid_t) (pid) << 3) | (clockid_t) (clock)) |