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futex_wait(): support for FUTEX_CLOCK_REALTIME

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This commit is contained in:
Balazs Gerofi
2015-11-13 12:45:03 +09:00
parent 94fcc5bb9a
commit 780d4fc29b
2 changed files with 19 additions and 3 deletions
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20
kernel/syscall.c
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@ -96,6 +96,7 @@ static char *syscall_name[] MCKERNEL_UNUSED = {
};
static ihk_spinlock_t tod_data_lock = SPIN_LOCK_UNLOCKED;
static void calculate_time_from_tsc(struct timespec *ts);
void check_signal(unsigned long, void *, int);
void do_signal(long rc, void *regs, struct thread *thread, struct sig_pending *pending, int num);
@ -3419,6 +3420,7 @@ SYSCALL_DECLARE(futex)
{
uint64_t timeout = 0; // No timeout
uint32_t val2 = 0;
int futex_clock_realtime = 0;
uint32_t *uaddr = (uint32_t *)ihk_mc_syscall_arg0(ctx);
int op = (int)ihk_mc_syscall_arg1(ctx);
@ -3429,6 +3431,9 @@ SYSCALL_DECLARE(futex)
/* Mask off the FUTEX_PRIVATE_FLAG,
* assume all futexes are address space private */
if (op & FUTEX_CLOCK_REALTIME) {
futex_clock_realtime = 1;
}
op = (op & FUTEX_CMD_MASK);
dkprintf("futex op=[%x, %s],uaddr=%lx, val=%x, utime=%lx, uaddr2=%lx, val3=%x, []=%x\n",
@ -3478,9 +3483,20 @@ SYSCALL_DECLARE(futex)
}
/* Compute timeout based on TSC/nanosec ratio */
else {
unsigned long nsec_timeout = ((long)utime->tv_sec * 1000000000ULL)
+ utime->tv_nsec;
unsigned long nsec_timeout;
if (!(futex_clock_realtime)) {
nsec_timeout = ((long)utime->tv_sec * NS_PER_SEC)
+ utime->tv_nsec;
}
else { /* FUTEX_CLOCK_REALTIME denotes absolute time */
struct timespec ats;
calculate_time_from_tsc(&ats);
nsec_timeout = (utime->tv_sec * NS_PER_SEC + utime->tv_nsec) -
(ats.tv_sec * NS_PER_SEC + ats.tv_nsec);
}
timeout = nsec_timeout * 1000 / ihk_mc_get_ns_per_tsc();
dkprintf("futex timeout: %lu\n", timeout);
}