com.oracle.svm.core.posix.headers

Class Semaphore

java.lang.Object

com.oracle.svm.core.posix.headers.Semaphore

public class Semaphore
extends Object

Declarations from .

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Semaphore.sem_t An opaque semaphore.

Constructor Summary

Constructors

Constructor and Description
Semaphore()

Method Summary

Modifier and Type	Method and Description
static int	sem_close(Semaphore.sem_t sem) sem_close() closes the named semaphore referred to by sem, allowing any resources that the system has allocated to the calling process for this semaphore to be freed.
static Semaphore.sem_t	SEM_FAILED() The value returned by Semaphore.sem_open(org.graalvm.nativeimage.c.type.CCharPointer, int, int, int) on failure.
static Semaphore.sem_t	sem_open(org.graalvm.nativeimage.c.type.CCharPointer name, int oflag, int mode, int value) sem_open() creates a new POSIX semaphore or opens an existing semaphore.
static int	sem_post_no_transition(Semaphore.sem_t sem) sem_post() increments (unlocks) the semaphore pointed to by sem.
static int	sem_unlink(org.graalvm.nativeimage.c.type.CCharPointer name) The named semaphore named name is removed.
static int	sem_wait(Semaphore.sem_t sem) sem_wait() decrements (locks) the semaphore pointed to by sem.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Semaphore

public Semaphore()

Method Detail

sem_open

public static Semaphore.sem_t sem_open(org.graalvm.nativeimage.c.type.CCharPointer name,
                                       int oflag,
                                       int mode,
                                       int value)

sem_open() creates a new POSIX semaphore or opens an existing semaphore. The semaphore is identified by name. For details of the construction of name, see sem_overview(7).

SEM_FAILED

public static Semaphore.sem_t SEM_FAILED()

The value returned by Semaphore.sem_open(org.graalvm.nativeimage.c.type.CCharPointer, int, int, int) on failure.

sem_wait

public static int sem_wait(Semaphore.sem_t sem)

sem_wait() decrements (locks) the semaphore pointed to by sem. If the semaphore's value is greater than zero, then the decrement proceeds, and the function returns, immediately. If the semaphore currently has the value zero, then the call blocks until either it becomes possible to perform the decrement (i.e., the semaphore value rises above zero), or a signal handler interrupts the call.

sem_post_no_transition

public static int sem_post_no_transition(Semaphore.sem_t sem)

sem_post() increments (unlocks) the semaphore pointed to by sem. If the semaphore's value consequently becomes greater than zero, then another process or thread blocked in a sem_wait(3) call will be woken up and proceed to lock the semaphore.

sem_close

public static int sem_close(Semaphore.sem_t sem)

sem_close() closes the named semaphore referred to by sem, allowing any resources that the system has allocated to the calling process for this semaphore to be freed.

sem_unlink

public static int sem_unlink(org.graalvm.nativeimage.c.type.CCharPointer name)

The named semaphore named name is removed. If the semaphore is in use by other processes, then name is immediately disassociated with the semaphore, but the semaphore itself will not be removed until all references to it have been closed.