SysRWLCreate (FUN) ¶ FUNCTION SysRWLCreate : RTS_IEC_HANDLE This function can be used to create a ReadWrite locking object (synchronization object) RETURN: Handle to the semaphore or RTS_INVALID_HANDLE if failed InOut: Scope Name Type Comment Return SysRWLCreate RTS_IEC_HANDLE Input pResult POINTER TO RTS_IEC_RESULT Pointer to runtime system error code (see CmpErrors.library)

SysRWLReadLock (FUN) ¶ FUNCTION SysRWLReadLock : RTS_IEC_RESULT This function to enter a read lock(synchronization object). NOTE: Several readers can enter the lock simultaneously! But they are synchronized against an entered write lock! RETURN: Returns the runtime system error code (see CmpErrors.library) InOut: Scope Name Type Comment Return SysRWLReadLock RTS_IEC_RESULT Input hRWLock RTS_IEC_HANDLE Handle to the ReadWrite lock object created by SysRWLCreate

SysRWLReadLockTry (FUN) ¶ FUNCTION SysRWLReadLockTry : RTS_IEC_RESULT This function tries enter a read lock(synchronization object). If a write lock is still active, the functions returns an error. The function succeeded as well, if another read lock is still active. NOTE: Several readers can enter the lock simultaneously! But they are synchronized against an entered write lock! RETURN: Returns the runtime system error code (see CmpErrors.library) InOut: Scope Name Type Comment Return SysRWLReadLockTry RTS_IEC_RESULT Input hRWLock RTS_IEC_HANDLE Handle to the ReadWrite lock object created by SysRWLCreate

SysRWLReadUnlock (FUN) ¶ FUNCTION SysRWLReadUnlock : RTS_IEC_RESULT This function leaves a read lock, entered by SysRWLReadLock (synchronization object). RETURN: Returns the runtime system error code (see CmpErrors.library) InOut: Scope Name Type Comment Return SysRWLReadUnlock RTS_IEC_RESULT Input hRWLock RTS_IEC_HANDLE Handle to the ReadWrite lock object created by SysRWLCreate

SysRWLWriteLock (FUN) ¶ FUNCTION SysRWLWriteLock : RTS_IEC_RESULT This function to enter a write lock(synchronization object). NOTE: Several readers can enter the lock simultaneously! But they are synchronized against an entered write lock! RETURN: Returns the runtime system error code (see CmpErrors.library) InOut: Scope Name Type Comment Return SysRWLWriteLock RTS_IEC_RESULT Input hRWLock RTS_IEC_HANDLE Handle to the ReadWrite lock object created by SysRWLCreate

SysRWLWriteLockTry (FUN) ¶ FUNCTION SysRWLWriteLockTry : RTS_IEC_RESULT This function tries enter a write lock(synchronization object). If a write lock is still active, the functions returns an error. NOTE: Several readers can enter the lock simultaneously! But they are synchronized against an entered write lock! RETURN: Returns the runtime system error code (see CmpErrors.library) InOut: Scope Name Type Comment Return SysRWLWriteLockTry RTS_IEC_RESULT Input hRWLock RTS_IEC_HANDLE Handle to the ReadWrite lock object created by SysRWLCreate

SysRWLWriteUnlock (FUN) ¶ FUNCTION SysRWLWriteUnlock : RTS_IEC_RESULT This function leaves a write lock, entered by SysRWLReadLock (synchronization object). RETURN: Returns the runtime system error code (see CmpErrors.library) InOut: Scope Name Type Comment Return SysRWLWriteUnlock RTS_IEC_RESULT Input hRWLock RTS_IEC_HANDLE Handle to the ReadWrite lock object created by SysRWLCreate

SysSem Implementation Library Documentation ¶ Company System Title SysSem Implementation Version 3.5.17.0 Categories System|SysLibs Author CODESYS Development GmbH Placeholder SysSem Implementation Description 1 ¶ Library provides access to operating system semaphores on the runtime system for data synchronization. ATTENTION: Be aware, that a hangup could occur, if your task will be suspended because of a watchdog error in your protected code! Contents: ¶ SysSemCreate (Function) SysSemDelete (Function) SysSemEnter (Function) SysSemLeave (Function) SysSemTry (Function) Indices and tables ¶ 1 Based on SysSem Implementation.library, last modified 20.04.2021, 16:07:18. LibDoc 4.4.0.0-b.27 The content file SysSem Implementation.clean.json was generated with CODESYS V3.5 SP16 Patch 3 on 20.04.2021, 16:07:18.

SysSemCreate (FUN) ¶ FUNCTION SysSemCreate : RTS_IEC_HANDLE This function can be used to create a semaphore (synchronization object). InOut: Scope Name Type Comment Return SysSemCreate RTS_IEC_HANDLE Handle to the semaphore or RTS_INVALID_HANDLE if failed. Input pResult POINTER TO RTS_IEC_RESULT Pointer to runtime system error code (see CmpErrors.library)

SysSemDelete (FUN) ¶ FUNCTION SysSemDelete : RTS_IEC_RESULT This function deletes the semaphore which is identified by its handle. InOut: Scope Name Type Comment Return SysSemDelete RTS_IEC_RESULT Return the runtime system error code (see CmpErrors.library) Input hSem RTS_IEC_HANDLE Handle of the semaphore