diff options
Diffstat (limited to 'libcutils/sched_policy.c')
| -rw-r--r-- | libcutils/sched_policy.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/libcutils/sched_policy.c b/libcutils/sched_policy.c index 9f092d6..2acc3c3 100644 --- a/libcutils/sched_policy.c +++ b/libcutils/sched_policy.c @@ -39,21 +39,20 @@ static inline SchedPolicy _policy(SchedPolicy p) #if defined(HAVE_ANDROID_OS) && defined(HAVE_SCHED_H) && defined(HAVE_PTHREADS) -#include <sched.h> #include <pthread.h> - -#ifndef SCHED_NORMAL - #define SCHED_NORMAL 0 -#endif - -#ifndef SCHED_BATCH - #define SCHED_BATCH 3 -#endif +#include <sched.h> +#include <sys/prctl.h> #define POLICY_DEBUG 0 #define CAN_SET_SP_SYSTEM 0 // non-zero means to implement set_sched_policy(tid, SP_SYSTEM) +// This prctl is only available in Android kernels. +#define PR_SET_TIMERSLACK_PID 41 + +// timer slack value in nS enforced when the thread moves to background +#define TIMER_SLACK_BG 40000000 + static pthread_once_t the_once = PTHREAD_ONCE_INIT; static int __sys_supports_schedgroups = -1; @@ -325,6 +324,8 @@ int set_sched_policy(int tid, SchedPolicy policy) ¶m); } + prctl(PR_SET_TIMERSLACK_PID, policy == SP_BACKGROUND ? TIMER_SLACK_BG : 0, tid); + return 0; } |