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Scheduling group cleanup - add comment, SP_DEFAULT 

Also tid == 0 maps to gettid() on platforms that support it.
This is needed by mediaserver code that was formerly using
the old C++ API.

Change-Id: I8baaa3e42315c9b924cec26b6da01e7cb69e0078
This commit is contained in:
Glenn Kasten 2012-03-16 09:43:19 -07:00
parent c28cbb2c5a
commit 69bfb1f099
2 changed files with 26 additions and 0 deletions
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5
include/cutils/sched_policy.h
View File

@ -21,21 +21,26 @@
extern "C" {
#endif
/* Keep in sync with THREAD_GROUP_* in frameworks/base/core/java/android/os/Process.java */
typedef enum {
SP_DEFAULT = -1,
SP_BACKGROUND = 0,
SP_FOREGROUND = 1,
SP_CNT,
SP_MAX = SP_CNT - 1,
SP_SYSTEM_DEFAULT = SP_FOREGROUND,
} SchedPolicy;
/* Assign thread tid to the cgroup associated with the specified policy.
* If the thread is a thread group leader, that is it's gettid() == getpid(),
* then the other threads in the same thread group are _not_ affected.
* On platforms which support gettid(), zero tid means current thread.
* Return value: 0 for success, or -errno for error.
*/
extern int set_sched_policy(int tid, SchedPolicy policy);
/* Return the policy associated with the cgroup of thread tid via policy pointer.
* On platforms which support gettid(), zero tid means current thread.
* Return value: 0 for success, or -1 for error and set errno.
*/
extern int get_sched_policy(int tid, SchedPolicy *policy);

21
libcutils/sched_policy.c
View File

@ -189,6 +189,11 @@ static int getSchedulerGroup(int tid, char* buf, size_t bufLen)
int get_sched_policy(int tid, SchedPolicy *policy)
{
#ifdef HAVE_GETTID
if (tid == 0) {
tid = gettid();
}
#endif
pthread_once(&the_once, __initialize);
if (__sys_supports_schedgroups) {
@ -219,8 +224,23 @@ int get_sched_policy(int tid, SchedPolicy *policy)
return 0;
}
/* Re-map SP_DEFAULT to the system default policy, and leave other values unchanged.
* Call this any place a SchedPolicy is used as an input parameter.
* Returns the possibly re-mapped policy.
*/
static inline SchedPolicy _policy(SchedPolicy p)
{
return p == SP_DEFAULT ? SP_SYSTEM_DEFAULT : p;
}
int set_sched_policy(int tid, SchedPolicy policy)
{
#ifdef HAVE_GETTID
if (tid == 0) {
tid = gettid();
}
#endif
policy = _policy(policy);
pthread_once(&the_once, __initialize);
#if POLICY_DEBUG
@ -275,6 +295,7 @@ int set_sched_policy(int tid, SchedPolicy policy)
const char *get_sched_policy_name(SchedPolicy policy)
{
policy = _policy(policy);
static const char * const strings[SP_CNT] = {
[SP_BACKGROUND] = "bg",
[SP_FOREGROUND] = "fg",