diff options
Diffstat (limited to 'src/cpu/kvm/timer.cc')
| -rw-r--r-- | src/cpu/kvm/timer.cc | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/src/cpu/kvm/timer.cc b/src/cpu/kvm/timer.cc index 6882063e4..cb48046f7 100644 --- a/src/cpu/kvm/timer.cc +++ b/src/cpu/kvm/timer.cc @@ -40,12 +40,30 @@ #include <algorithm> #include <csignal> #include <ctime> +#include <unistd.h> +#include <sys/syscall.h> #include "base/misc.hh" #include "base/trace.hh" #include "cpu/kvm/timer.hh" #include "debug/KvmTimer.hh" +/* According to timer_create(2), the value SIGEV_THREAD_ID can be used + * to specify which thread a timer signal gets delivered to. According + * to the man page, the member sigev_notify_thread is used to specify + * the TID. This member is currently not defined by default in + * siginfo.h on x86, so we define it here as a workaround. + */ +#ifndef sigev_notify_thread_id +#define sigev_notify_thread_id _sigev_un._tid +#endif + +static pid_t +gettid() +{ + return syscall(__NR_gettid); +} + /** * Minimum number of cycles that a host can spend in a KVM call (used * to calculate the resolution of some timers). @@ -62,11 +80,9 @@ PosixKvmTimer::PosixKvmTimer(int signo, clockid_t clockID, { struct sigevent sev; - // TODO: We should request signal delivery to thread instead of - // the process here. Unfortunately this seems to be broken, or at - // least not work as specified in the man page. - sev.sigev_notify = SIGEV_SIGNAL; + sev.sigev_notify = SIGEV_THREAD_ID; sev.sigev_signo = signo; + sev.sigev_notify_thread_id = gettid(); sev.sigev_value.sival_ptr = NULL; while (timer_create(clockID, &sev, &timer) == -1) { |