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/* ---------------------------------------------------------------------------
*
* (c) The GHC Team, 2001-2005
*
* Accessing OS threads functionality in a (mostly) OS-independent
* manner.
*
* --------------------------------------------------------------------------*/
#if defined(__linux__)
/* We want GNU extensions in DEBUG mode for mutex error checking */
/* We also want the affinity API, which requires _GNU_SOURCE */
#define _GNU_SOURCE
#endif
#include "Rts.h"
#if defined(THREADED_RTS)
#include "OSThreads.h"
#include "RtsUtils.h"
#include "Task.h"
#if HAVE_STRING_H
#include <string.h>
#endif
#if !defined(HAVE_PTHREAD_H)
#error pthreads.h is required for the threaded RTS on Posix platforms
#endif
#if defined(HAVE_SCHED_H)
#include <sched.h>
#endif
/*
* This (allegedly) OS threads independent layer was initially
* abstracted away from code that used Pthreads, so the functions
* provided here are mostly just wrappers to the Pthreads API.
*
*/
void
initCondition( Condition* pCond )
{
pthread_cond_init(pCond, NULL);
return;
}
void
closeCondition( Condition* pCond )
{
pthread_cond_destroy(pCond);
return;
}
rtsBool
broadcastCondition ( Condition* pCond )
{
return (pthread_cond_broadcast(pCond) == 0);
}
rtsBool
signalCondition ( Condition* pCond )
{
return (pthread_cond_signal(pCond) == 0);
}
rtsBool
waitCondition ( Condition* pCond, Mutex* pMut )
{
return (pthread_cond_wait(pCond,pMut) == 0);
}
void
yieldThread()
{
sched_yield();
return;
}
void
shutdownThread()
{
pthread_exit(NULL);
}
int
createOSThread (OSThreadId* pId, OSThreadProc *startProc, void *param)
{
int result = pthread_create(pId, NULL, (void *(*)(void *))startProc, param);
if(!result)
pthread_detach(*pId);
return result;
}
OSThreadId
osThreadId()
{
return pthread_self();
}
rtsBool
osThreadIsAlive(OSThreadId id STG_UNUSED)
{
// no good way to implement this on POSIX, AFAICT. Returning true
// is safe.
return rtsTrue;
}
void
initMutex(Mutex* pMut)
{
#if defined(DEBUG)
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr,PTHREAD_MUTEX_ERRORCHECK);
pthread_mutex_init(pMut,&attr);
#else
pthread_mutex_init(pMut,NULL);
#endif
return;
}
void
closeMutex(Mutex* pMut)
{
pthread_mutex_destroy(pMut);
}
void
newThreadLocalKey (ThreadLocalKey *key)
{
int r;
if ((r = pthread_key_create(key, NULL)) != 0) {
barf("newThreadLocalKey: %s", strerror(r));
}
}
void *
getThreadLocalVar (ThreadLocalKey *key)
{
return pthread_getspecific(*key);
// Note: a return value of NULL can indicate that either the key
// is not valid, or the key is valid and the data value has not
// yet been set. We need to use the latter case, so we cannot
// detect errors here.
}
void
setThreadLocalVar (ThreadLocalKey *key, void *value)
{
int r;
if ((r = pthread_setspecific(*key,value)) != 0) {
barf("setThreadLocalVar: %s", strerror(r));
}
}
void
freeThreadLocalKey (ThreadLocalKey *key)
{
int r;
if ((r = pthread_key_delete(*key)) != 0) {
barf("freeThreadLocalKey: %s", strerror(r));
}
}
static void *
forkOS_createThreadWrapper ( void * entry )
{
Capability *cap;
cap = rts_lock();
cap = rts_evalStableIO(cap, (HsStablePtr) entry, NULL);
taskTimeStamp(myTask());
rts_unlock(cap);
return NULL;
}
int
forkOS_createThread ( HsStablePtr entry )
{
pthread_t tid;
int result = pthread_create(&tid, NULL,
forkOS_createThreadWrapper, (void*)entry);
if(!result)
pthread_detach(tid);
return result;
}
nat
getNumberOfProcessors (void)
{
static nat nproc = 0;
if (nproc == 0) {
#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
nproc = sysconf(_SC_NPROCESSORS_ONLN);
#elif defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_CONF)
nproc = sysconf(_SC_NPROCESSORS_CONF);
#else
nproc = 1;
#endif
}
return nproc;
}
// Schedules the thread to run on CPU n of m. m may be less than the
// number of physical CPUs, in which case, the thread will be allowed
// to run on CPU n, n+m, n+2m etc.
void
setThreadAffinity (nat n, nat m)
{
#if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_SETAFFINITY)
nat nproc;
cpu_set_t cs;
nat i;
nproc = getNumberOfProcessors();
CPU_ZERO(&cs);
for (i = n; i < nproc; i+=m) {
CPU_SET(n, &cs);
}
sched_setaffinity(0, sizeof(cpu_set_t), &cs);
#endif
}
#else /* !defined(THREADED_RTS) */
int
forkOS_createThread ( HsStablePtr entry STG_UNUSED )
{
return -1;
}
#endif /* !defined(THREADED_RTS) */
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