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/*
* @OSF_COPYRIGHT@
*
*/
/*
* File: kern/sync_sema.h
* Author: Joseph CaraDonna
*
* Contains RT distributed semaphore synchronization service definitions.
*/
#ifndef _KERN_SYNC_SEMA_H_
#define _KERN_SYNC_SEMA_H_
#include <kern/kern_types.h>
#include <mach/sync_policy.h>
#include <mach/clock_types.h>
#ifdef MACH_KERNEL_PRIVATE
#include <kern/queue.h>
#include <kern/waitq.h>
#include <os/refcnt.h>
typedef struct semaphore {
queue_chain_t task_link; /* chain of semaphores owned by a task */
struct waitq waitq; /* queue of blocked threads & lock */
task_t owner; /* task that owns semaphore */
ipc_port_t port; /* semaphore port */
os_ref_atomic_t ref_count; /* reference count */
int count; /* current count value */
} Semaphore;
#define semaphore_lock(semaphore) waitq_lock(&(semaphore)->waitq)
#define semaphore_unlock(semaphore) waitq_unlock(&(semaphore)->waitq)
extern void semaphore_reference(
semaphore_t semaphore);
extern void semaphore_dereference(
semaphore_t semaphore);
#pragma GCC visibility push(hidden)
extern void semaphore_destroy_all(
task_t task);
extern semaphore_t convert_port_to_semaphore(
ipc_port_t port);
extern ipc_port_t convert_semaphore_to_port(
semaphore_t semaphore);
extern kern_return_t port_name_to_semaphore(
mach_port_name_t name,
semaphore_t *semaphore);
#pragma GCC visibility pop
#endif /* MACH_KERNEL_PRIVATE */
#if XNU_KERNEL_PRIVATE
#pragma GCC visibility push(hidden)
#define SEMAPHORE_CONT_NULL ((semaphore_cont_t)NULL)
typedef void (*semaphore_cont_t)(kern_return_t);
extern kern_return_t semaphore_signal_internal_trap(
mach_port_name_t sema_name);
extern kern_return_t semaphore_timedwait_signal_trap_internal(
mach_port_name_t wait_name,
mach_port_name_t signal_name,
unsigned int sec,
clock_res_t nsec,
semaphore_cont_t);
extern kern_return_t semaphore_timedwait_trap_internal(
mach_port_name_t name,
unsigned int sec,
clock_res_t nsec,
semaphore_cont_t);
extern kern_return_t semaphore_wait_signal_trap_internal(
mach_port_name_t wait_name,
mach_port_name_t signal_name,
semaphore_cont_t);
extern kern_return_t semaphore_wait_trap_internal(
mach_port_name_t name,
semaphore_cont_t);
#pragma GCC visibility pop
#endif /* XNU_KERNEL_PRIVATE */
#endif /* _KERN_SYNC_SEMA_H_ */