smp.h

Include dependency graph for smp.h:

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This graph shows which files directly or indirectly include smp.h:

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Multicore support functions.

This header defines multicore support functions to be implemented for SMP builds.

Defines

CLANG_THREAD_SANITIZE_SAFE
ATOMIC
TYPEDEF_MUTEX
TYPEDEF_SPINLOCK
TYPEDEF_CONDVAR
TYPEDEF_RWLOCK
TYPEDEF_GLOBALCONTEXT
SMP_SPINLOCK_LOCK(spinlock) smp_spinlock_lock(spinlock)
SMP_SPINLOCK_TRYLOCK(spinlock) smp_spinlock_trylock(spinlock)
SMP_SPINLOCK_UNLOCK(spinlock) smp_spinlock_unlock(spinlock)
SMP_MUTEX_LOCK(mutex) smp_mutex_lock(mutex)
SMP_MUTEX_TRYLOCK(mutex) smp_mutex_trylock(mutex)
SMP_MUTEX_UNLOCK(mutex) smp_mutex_unlock(mutex)
SMP_RWLOCK_RDLOCK(lock) smp_rwlock_rdlock(lock)
SMP_RWLOCK_TRYRDLOCK(lock) smp_rwlock_tryrdlock(lock)
SMP_RWLOCK_WRLOCK(lock) smp_rwlock_wrlock(lock)
SMP_RWLOCK_UNLOCK(lock) smp_rwlock_unlock(lock)

Typedefs

typedef struct Mutex Mutex
typedef struct SpinLock SpinLock
typedef struct CondVar CondVar
typedef struct RWLock RWLock
typedef struct GlobalContext GlobalContext

Functions

Mutex *smp_mutex_create()

Create a new mutex.

Returns:

a pointer to a mutex.

void smp_mutex_destroy(Mutex *mtx)

Destroy a mutex.

Parameters:
  • mtx – the mutex to destroy

void smp_mutex_lock(Mutex *mtx)

Lock a mutex.

Parameters:
  • mtx – the mutex to lock

bool smp_mutex_trylock(Mutex *mtx)

Try and lock a mutex.

Parameters:
  • mtx – the mutex to lock

Returns:

true if the mutex was acquired.

void smp_mutex_unlock(Mutex *mtx)

Unlock a mutex.

Parameters:
  • mtx – the mutex to unlock

CondVar *smp_condvar_create()

Create a new condition variable.

Returns:

a pointer to a cv.

void smp_condvar_destroy(CondVar *cv)

Destroy a condition variable.

Parameters:
  • cv – variable to destroy.

void smp_condvar_wait(CondVar *cv, Mutex *mtx)

Wait on a condition variable, atomically unlocking the mutex.

Parameters:
  • cv – variable to wait on.

  • mtx – mutex to unlock/lock.

void smp_condvar_signal(CondVar *cv)

Signal a single thread waiting on a condition variable.

Parameters:
  • cv – variable to signal.

RWLock *smp_rwlock_create()

Create a new rwlock.

A RW Lock can be replaced by a mutex if RW Lock are not available on the platform.

Returns:

a pointer to a lock.

void smp_rwlock_destroy(RWLock *lock)

Destroy a rwlock.

Parameters:
  • lock – the lock to destroy

void smp_rwlock_rdlock(RWLock *lock)

Read lock a rwlock.

Parameters:
  • lock – the lock to read lock

bool smp_rwlock_tryrdlock(RWLock *lock)

Try to acquire read lock of a rwlock.

Parameters:
  • lock – the lock to read lock

Returns:

true if lock was acquired

void smp_rwlock_wrlock(RWLock *lock)

Write lock a rwlock.

Parameters:
  • lock – the lock to write lock

void smp_rwlock_unlock(RWLock *lock)

Unlock a rwlock.

Parameters:
  • lock – the lock to unlock

static inline void smp_spinlock_init(SpinLock *lock)

Initialize a spinlock based on atomics.

Parameters:
  • lock – the spin lock to initialize

static inline void smp_spinlock_lock(SpinLock *lock)

Lock a spinlock.

Parameters:
  • lock – the spin lock to lock

static inline bool smp_spinlock_trylock(SpinLock *lock)

Try to lock a spinlock.

Parameters:
  • lock – the spin lock to lock

Returns:

true if the spin lock was locked

static inline void smp_spinlock_unlock(SpinLock *lock)

Unlock a spinlock.

Parameters:
  • lock – the spin lock to unlock

int smp_get_online_processors()

Get the number of online processors to configure schedulers.

This value is one plus the maximum number of times smp_scheduler_start will be called by the scheduler.

Returns:

the number of online processors.

void smp_scheduler_start(GlobalContext *glb)

Start a new scheduler, calling scheduler_entry_point with the given global context.

Parameters:
  • glb – the global context

bool smp_is_main_thread(GlobalContext *glb)

Determine if caller is in the main thread, i.e. thread that was not started with acmsmp_scheduler_start.

struct SpinLock
#include <smp.h>

Public Members

int lock