diff options
| -rw-r--r-- | include/utils/threads.h | 7 | ||||
| -rw-r--r-- | libs/utils/Threads.cpp | 35 |
2 files changed, 42 insertions, 0 deletions
diff --git a/include/utils/threads.h b/include/utils/threads.h index c84a9b4..c685625 100644 --- a/include/utils/threads.h +++ b/include/utils/threads.h @@ -143,6 +143,13 @@ extern int androidSetThreadSchedulingGroup(pid_t tid, int grp); // in either case errno is set. Thread ID zero means current thread. extern int androidSetThreadPriority(pid_t tid, int prio); +// Get the current scheduling group of a particular thread. Normally returns +// one of the ANDROID_TGROUP constants other than ANDROID_TGROUP_DEFAULT. +// Returns ANDROID_TGROUP_DEFAULT if no pthread support (e.g. on host) or if +// scheduling groups are disabled. Returns INVALID_OPERATION if unexpected error. +// Thread ID zero means current thread. +extern int androidGetThreadSchedulingGroup(pid_t tid); + #ifdef __cplusplus } #endif diff --git a/libs/utils/Threads.cpp b/libs/utils/Threads.cpp index d18c0a2..02c380b 100644 --- a/libs/utils/Threads.cpp +++ b/libs/utils/Threads.cpp @@ -368,6 +368,41 @@ int androidSetThreadPriority(pid_t tid, int pri) return rc; } +int androidGetThreadSchedulingGroup(pid_t tid) +{ + int ret = ANDROID_TGROUP_DEFAULT; + +#if defined(HAVE_PTHREADS) + // convention is to not call get/set_sched_policy methods if disabled by property + pthread_once(&gDoSchedulingGroupOnce, checkDoSchedulingGroup); + if (gDoSchedulingGroup) { + SchedPolicy policy; + // get_sched_policy does not support tid == 0 + if (tid == 0) { + tid = androidGetTid(); + } + if (get_sched_policy(tid, &policy) < 0) { + ret = INVALID_OPERATION; + } else { + switch (policy) { + case SP_BACKGROUND: + ret = ANDROID_TGROUP_BG_NONINTERACT; + break; + case SP_FOREGROUND: + ret = ANDROID_TGROUP_FG_BOOST; + break; + default: + // should not happen, as enum SchedPolicy does not have any other values + ret = INVALID_OPERATION; + break; + } + } + } +#endif + + return ret; +} + namespace android { /* |