From a311086d622d3c778e1da57cfae167c0ab1c0fb4 Mon Sep 17 00:00:00 2001 From: rpj Date: Sun, 1 Jul 2001 13:23:10 +0000 Subject: 2001-06-25 Ross Johnson * create.c (pthread_create): Add priority inheritance attributes. * mutex.c (pthread_mutex_lock): Remove some overhead for PTHREAD_MUTEX_NORMAL mutex types. Specifically, avoid calling pthread_self() and pthread_equal() to check/set the mutex owner. Introduce a new pseudo owner for this type. Test results suggest increases in speed of up to 90% for non-blocking locks. This is the default type of mutex used internally by other synchronising objects, ie. condition variables and read-write locks. The test rwlock7.c shows about a 30-35% speed increase over snapshot 2001-06-06. The price of this is that the application developer must ensure correct behaviour, or explicitly set the mutex to a safer type such as PTHREAD_MUTEX_ERRORCHECK. For example, PTHREAD_MUTEX_NORMAL (or PTHREAD_MUTEX_DEFAULT) type mutexes will not return an error if a thread which is not the owner calls pthread_mutex_unlock. The call will succeed in unlocking the mutex if it is currently locked, but a subsequent unlock by the true owner will then fail with EPERM. This is however consistent with some other implementations. (pthread_mutex_unlock): Likewise. (pthread_mutex_trylock): Likewise. (pthread_mutex_destroy): Likewise. * attr.c (pthread_attr_init): PTHREAD_EXPLICIT_SCHED is the default inheritance attribute; THREAD_PRIORITY_NORMAL is the default priority for new threads. * sched.c (pthread_attr_setschedpolicy): Added routine. (pthread_attr_getschedpolicy): Added routine. (pthread_attr_setinheritsched): Added routine. (pthread_attr_getinheritsched): Added routine. * pthread.h (sched_rr_set_interval): Added as a macro; returns -1 with errno set to ENOSYS. 2001-06-23 Ross Johnson *sched.c (pthread_attr_setschedparam): Add priority range check. (sched_setscheduler): New function; checks for a valid pid and policy; checks for permission to set information in the target process; expects pid to be a Win32 process ID, not a process handle; the only scheduler policy allowed is SCHED_OTHER. (sched_getscheduler): Likewise, but checks for permission to query. * pthread.h (SCHED_*): Moved to sched.h as defined in the POSIX standard. * sched.h (SCHED_*): Moved from pthread.h. (pid_t): Defined if necessary. (sched_setscheduler): Defined. (sched_getscheduler): Defined. * pthread.def (sched_setscheduler): Exported. (sched_getscheduler): Likewise. 2001-06-23 Ross Johnson Contributed by - Ralf Brese * create.c (pthread_create): Set thread priority from thread attributes. --- sched.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) (limited to 'sched.h') diff --git a/sched.h b/sched.h index eff9d6b..e4e02a2 100644 --- a/sched.h +++ b/sched.h @@ -28,6 +28,49 @@ #ifndef _SCHED_H #define _SCHED_H +#if !defined( PTW32_HEADER ) +#define PTW32_HEADER + +#ifdef _UWIN +# define HAVE_STRUCT_TIMESPEC 1 +# define HAVE_SIGNAL_H 1 +# undef HAVE_CONFIG_H +# pragma comment(lib, "pthread") +#endif + +#endif /* PTW32_HEADER */ + +#if defined(__MINGW32__) || defined(_UWIN) +/* For pid_t */ +# include +/* Required by Unix 98 - including sched.h makes time.h available */ +# include +#else +typedef DWORD pid_t; +#endif + +#if ! defined(HAVE_STRUCT_TIMESPEC) && ! defined(PTW32_TIMESPEC) +#define PTW32_TIMESPEC +struct timespec { + long tv_sec; + long tv_nsec; +}; +#endif /* HAVE_STRUCT_TIMESPEC */ + + +/* Thread scheduling policies */ +enum { + SCHED_OTHER = 0, + SCHED_FIFO, + SCHED_RR, + SCHED_MIN = SCHED_OTHER, + SCHED_MAX = SCHED_RR +}; + +struct sched_param { + int sched_priority; +}; + #ifdef __cplusplus extern "C" { @@ -39,6 +82,11 @@ int sched_get_priority_min (int policy); int sched_get_priority_max (int policy); +int sched_setscheduler (pid_t pid, int policy); + +int sched_getscheduler (pid_t pid); + +int sched_rr_get_interval(pid_t pid, struct timespec * interval); #ifdef __cplusplus } /* End of extern "C" */ -- cgit v1.2.3