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/*
Parameters for the Linux kernel ABI for CPU clocks, the 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.
*/
#include <time.h>
#define CPUCLOCK_PID(clock) ((pid_t) ~((clock) >> 3))
#define CPUCLOCK_PERTHREAD(clock) \
(((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
#define CPUCLOCK_PID_MASK 7
#define CPUCLOCK_PERTHREAD_MASK 4
#define CPUCLOCK_WHICH(clock) ((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
#define CPUCLOCK_CLOCK_MASK 3
#define CPUCLOCK_PROF 0
#define CPUCLOCK_VIRT 1
#define CPUCLOCK_SCHED 2
#define CPUCLOCK_MAX 3
static inline clockid_t
make_process_cpuclock (unsigned int pid, clockid_t clock)
{
return ((~pid) << 3) | clock;
}
static inline clockid_t
make_thread_cpuclock (unsigned int tid, clockid_t clock)
{
return make_process_cpuclock (tid, clock | CPUCLOCK_PERTHREAD_MASK);
}
#define PROCESS_CLOCK make_process_cpuclock (0, CPUCLOCK_SCHED)
#define THREAD_CLOCK make_thread_cpuclock (0, CPUCLOCK_SCHED)
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