Difference between revisions of "Unit Threads"

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! '''Note'''
 
! '''Note'''
 
| If the Synchronizer is locked for writing by the current thread and the count  is one then decrement the count. If the count is greater than one then return an error. If the count reaches zero then convert to reader lock and release all waiting reader threads. If the Synchronizer is locked for reading then return an error. If the Synchronizer is not locked then return an error. Since writer locks are recursive, caller must ensure that one and only one writer lock is held by the current thread.
 
| If the Synchronizer is locked for writing by the current thread and the count  is one then decrement the count. If the count is greater than one then return an error. If the count reaches zero then convert to reader lock and release all waiting reader threads. If the Synchronizer is locked for reading then return an error. If the Synchronizer is not locked then return an error. Since writer locks are recursive, caller must ensure that one and only one writer lock is held by the current thread.
 +
|-
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|}
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</div></div>
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<br />
 +
 +
'''List functions'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ListCreate:TListHandle;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Create and insert a new List entry</div>
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<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
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|-
 +
! '''Return'''
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| Handle of new List entry or INVALID_HANDLE_VALUE if entry could not be created
 +
|-
 +
|}
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</div></div>
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<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ListCreateEx(ListType:LongWord; Flags:LongWord):TListHandle;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Create and insert a new List entry</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! '''ListType'''
 +
| Type of list to create (eg LIST_TYPE_WAIT_SEMAPHORE)
 +
|-
 +
! '''Flags'''
 +
| Flags for the new list (eg LIST_FLAG_IRQ)
 +
|-
 +
! '''Return'''
 +
| Handle of new List entry or INVALID_HANDLE_VALUE if entry could not be created
 +
|-
 +
|}
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</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function ListDestroy(List:TListHandle):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Destroy and remove an existing List entry</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! '''List'''
 +
| Handle of List entry to destroy
 +
|-
 +
! '''Return'''
 +
| ERROR_SUCCESS if completed or another error code on failure
 +
|-
 +
! '''Note'''
 +
| If list is part of a synchronisation object then caller must hold the lock on the object containing the list
 
|-
 
|-
 
|}
 
|}

Revision as of 01:25, 9 September 2016

Return to Unit Reference


Description

To be documented

Constants

To be documented

Type definitions

To be documented

Public variables

To be documented

Function declarations


Initialization functions 

procedure LocksInit;
Description: Initialize Locks
Note To be documented 


procedure ThreadsInit;
Description: Initialize Threading
Note To be documented 


procedure PrimaryInit;
Description: Initialize the primary CPU
Note To be documented 


procedure SchedulerInit;
Description: Initialize the thread scheduler
Note To be documented 


procedure SchedulerStart(CPUID:LongWord);
Description: Initialize the thread scheduler for secondary CPUs (Where Applicable)
Note To be documented 


procedure SecondaryInit;
Description: Initialize the secondary CPUs (Where Applicable)
Note To be documented 


procedure SecondaryBoot(CPUID:LongWord);
Description: Boot the specified secondary CPU (Where Applicable)
Note To be documented 


procedure SecondaryStart(CPUID:LongWord);
Description: Startup procedure for secondary CPUs (Where Applicable)
Note The Secondary Boot procedure should have already cleared L1 cache, enabled FPU, MMU, Vectors and PageTables before calling this function. The thread id of the IRQ or FIQ should also have been loaded into the appropriate registers. 


function IRQExecute(Parameter:Pointer):PtrInt;
Description: To be documented
Note To be documented 


function FIQExecute(Parameter:Pointer):PtrInt;
Description: To be documented
Note To be documented 


function SWIExecute(Parameter:Pointer):PtrInt;
Description: To be documented
Note To be documented 


function IdleExecute(Parameter:Pointer):PtrInt;
Description: To be documented
Note To be documented 


function MainExecute(Parameter:Pointer):PtrInt;
Description: To be documented
Note To be documented 


function TimerExecute(Parameter:Pointer):PtrInt;
Description: To be documented
Note To be documented 


function WorkerExecute(Parameter:Pointer):PtrInt;
Description: To be documented
Note To be documented 


function IdleCalibrate:LongWord;
Description: Calibrate the idle thread loop by counting the number of loops in 100ms
Note To be documented


Spin functions 

function SpinCreate:TSpinHandle;
Description: Create and insert a new Spin entry
Return Handle of new Spin entry or INVALID_HANDLE_VALUE if entry could not be created 


function SpinCreateEx(InitialOwner:Boolean):TSpinHandle;
Description: Create and insert a new Spin entry
InitialOwner If true set the state of the spin to locked and the owner to the current thread
Return Handle of new Spin entry or INVALID_HANDLE_VALUE if entry could not be created 


function SpinDestroy(Spin:TSpinHandle):LongWord;
Description: Destroy and remove an existing Spin entry
Spin Handle of Spin entry to destroy
Return ERROR_SUCCESS if completed or another error code on failure 


function SpinOwner(Spin:TSpinHandle):TThreadHandle;
Description: Get the current owner of an existing Spin entry
Spin Handle of Spin entry to get owner for
Return Handle of owning thread or INVALID_HANDLE_VALUE if not currently owned 


function SpinLock(Spin:TSpinHandle):LongWord;
Description: Lock an existing Spin entry
Spin Handle of Spin entry to lock
Return ERROR_SUCCESS if completed or another error code on failure 


function SpinUnlock(Spin:TSpinHandle):LongWord;
Description: Unlock an existing Spin entry
Spin Handle of Spin entry to unlock
Return ERROR_SUCCESS if completed or another error code on failure 


function SpinLockIRQ(Spin:TSpinHandle):LongWord;
Description: Lock an existing Spin entry, disable IRQ and save the previous IRQ state
Spin Handle of Spin entry to lock
Return ERROR_SUCCESS if completed or another error code on failure 


function SpinUnlockIRQ(Spin:TSpinHandle):LongWord;
Description: Unlock an existing Spin entry and restore the previous IRQ state
Spin Handle of Spin entry to unlock
Return ERROR_SUCCESS if completed or another error code on failure 


function SpinLockFIQ(Spin:TSpinHandle):LongWord;
Description: Lock an existing Spin entry, disable FIQ and save the previous FIQ state
Spin Handle of Spin entry to lock
Return ERROR_SUCCESS if completed or another error code on failure 


function SpinUnlockFIQ(Spin:TSpinHandle):LongWord;
Description: Unlock an existing Spin entry and restore the previous FIQ state
Spin Handle of Spin entry to unlock
Return ERROR_SUCCESS if completed or another error code on failure 


function SpinLockIRQFIQ(Spin:TSpinHandle):LongWord;
Description: Lock an existing Spin entry, disable IRQ and FIQ and save the previous IRQ and FIQ state
Spin Handle of Spin entry to lock
Return ERROR_SUCCESS if completed or another error code on failure 


function SpinUnlockIRQFIQ(Spin:TSpinHandle):LongWord;
Description: Unlock an existing Spin entry and restore the previous IRQ and FIQ state
Spin Handle of Spin entry to unlock
Return ERROR_SUCCESS if completed or another error code on failure 


function SpinCheckIRQ(Spin:TSpinHandle):Boolean;
Description: Check the mask that stores the previous IRQ state to determine if IRQ is enabled
Spin Handle of Spin entry to check
Return True if the mask would enable IRQ on restore, False if it would not
Note The Spin entry must be locked by the current thread 


function SpinCheckFIQ(Spin:TSpinHandle):Boolean;
Description: Check the mask that stores the previous FIQ state to determine if FIQ is enabled
Spin Handle of Spin entry to check
Return True if the mask would enable FIQ on restore, False if it would not
Note The Spin entry must be locked by the current thread 


function SpinExchangeIRQ(Spin1,Spin2:TSpinHandle):LongWord;
Description: Exchange the previous IRQ state between two Spin entries
Spin1 Handle of first Spin entry
Spin2 Handle of second Spin entry
Return ERROR_SUCCESS if completed or another error code on failure
Note Both Spin entries must be locked by the current thread 


function SpinExchangeFIQ(Spin1,Spin2:TSpinHandle):LongWord;
Description: Exchange the previous FIQ state between two Spin entries
Spin1 Handle of first Spin entry
Spin2 Handle of second Spin entry
Return ERROR_SUCCESS if completed or another error code on failure
Note Both Spin entries must be locked by the current thread


Mutex functions 

function MutexCreate:TMutexHandle;
Description: Create and insert a new Mutex entry
Return Handle of new Mutex entry or INVALID_HANDLE_VALUE if entry could not be created 


function MutexCreateEx(InitialOwner:Boolean; SpinCount:LongWord; Flags:LongWord):TMutexHandle;
Description: Create and insert a new Mutex entry
InitialOwner If true set the state of the mutex to locked and the owner to the current thread
SpinCount The number of times the mutex will spin before yielding (Always 0 if CPU count equals 1)
Flags The flags for the Mutex entry (eg MUTEX_FLAG_RECURSIVE)
Return Handle of new Mutex entry or INVALID_HANDLE_VALUE if entry could not be created 


function MutexDestroy(Mutex:TMutexHandle):LongWord;
Description: Destroy and remove an existing Mutex entry
Mutex Handle of Mutex entry to destroy
Return ERROR_SUCCESS if completed or another error code on failure 


function MutexFlags(Mutex:TMutexHandle):LongWord;
Description: Get the current flags of an existing Mutex entry
Mutex Handle of Mutex entry to get flags for
Return Current flags or INVALID_HANDLE_VALUE on error 


function MutexCount(Mutex:TMutexHandle):LongWord;
Description: Get the current lock count of an existing Mutex entry
Mutex Mutex to get count for
Return Current lock count or INVALID_HANDLE_VALUE on error
Note Count is only valid if Flags includes MUTEX_FLAG_RECURSIVE 


function MutexOwner(Mutex:TMutexHandle):TThreadHandle;
Description: Get the current owner of an existing Mutex entry
Mutex Handle of Mutex entry to get owner for
Return Handle of owning thread or INVALID_HANDLE_VALUE if not currently owned 


function MutexLock(Mutex:TMutexHandle):LongWord;
Description: Lock an existing Mutex entry
Mutex Handle of Mutex entry to lock
Return ERROR_SUCCESS if completed or another error code on failure 


function MutexUnlock(Mutex:TMutexHandle):LongWord;
Description: Unlock an existing Mutex entry
Mutex Handle of Mutex entry to unlock
Return ERROR_SUCCESS if completed or another error code on failure 


function MutexTryLock(Mutex:TMutexHandle):LongWord;
Description: Try to lock an existing Mutex entry
Mutex Mutex to try to lock
Return ERROR_SUCCESS if completed, ERROR_LOCKED if already locked or another error code on failure
Note If the Mutex is not locked then lock it and mark the owner as the current thread. If the Mutex is already locked then return immediately with an error and do not wait for it to be unlocked.


Critical section functions 

function CriticalSectionCreate:TCriticalSectionHandle;
Description: Create and insert a new CriticalSection entry
Return Handle of new CriticalSection entry or INVALID_HANDLE_VALUE if entry could not be created 


function CriticalSectionCreateEx(InitialOwner:Boolean; SpinCount:LongWord):TCriticalSectionHandle;
Description: Create and insert a new CriticalSection entry
CriticalSection If true set the state of the criticalsection to locked and the owner to the current thread
SpinCount The number of times the criticalsection will spin before waiting (Always 0 if CPU count equals 1)
Return Handle of new CriticalSection entry or INVALID_HANDLE_VALUE if entry could not be created 


function CriticalSectionDestroy(CriticalSection:TCriticalSectionHandle):LongWord;
Description: Destroy and remove an existing CriticalSection entry
CriticalSection Handle of CriticalSection entry to destroy
Return ERROR_SUCCESS if completed or another error code on failure 


function CriticalSectionCount(CriticalSection:TCriticalSectionHandle):LongWord;
Description: Get the current lock count of an existing CriticalSection entry
CriticalSection CriticalSection to get count for
Return Current lock count or INVALID_HANDLE_VALUE on error 


function CriticalSectionOwner(CriticalSection:TCriticalSectionHandle):TThreadHandle;
Description: Get the current owner of an existing CriticalSection entry
CriticalSection CriticalSection to get owner for
Return Handle of owning thread or INVALID_HANDLE_VALUE if not currently owned 


function CriticalSectionSetSpinCount(CriticalSection:TCriticalSectionHandle; SpinCount:LongWord):LongWord;
Description: Set the spin count of an existing CriticalSection entry
CriticalSection CriticalSection to set spin count for
SpinCount The spin count value to set
Return Current spin count or INVALID_HANDLE_VALUE on error 


function CriticalSectionLock(CriticalSection:TCriticalSectionHandle):LongWord;
Description: Lock an existing CriticalSection entry
CriticalSection CriticalSection to lock
Return ERROR_SUCCESS if completed or another error code on failure
Note If the CriticalSection is not locked then lock it, set the count to one and mark the owner as the current thread. If the CriticalSection is already locked by the current thread then increment the count and return immediately. If the CriticalSection is already locked by another thread then wait until it is unlocked. 


function CriticalSectionLockEx(CriticalSection:TCriticalSectionHandle; Timeout:LongWord):LongWord;
Description: Lock an existing CriticalSection entry
CriticalSection CriticalSection to lock
Timeout Milliseconds to wait before timeout (0 equals do not wait, INFINITE equals wait forever)
Return ERROR_SUCCESS if completed or another error code on failure
Note If the CriticalSection is not locked then lock it, set the count to one and mark the owner as the current thread. If the CriticalSection is already locked by the current thread then increment the count and return immediately. If the CriticalSection is already locked by another thread then wait until it is unlocked. 


function CriticalSectionUnlock(CriticalSection:TCriticalSectionHandle):LongWord;
Description: Unlock an existing CriticalSection entry
CriticalSection CriticalSection to unlock
Return ERROR_SUCCESS if completed or another error code on failure
Note If the CriticalSection is locked by the current thread then decrement the count. If the count is greater than zero then return immediately. If the count reaches zero then unlock the CriticalSection and release the first thread waiting for it to be unlocked. If the CriticalSection is locked by another thread then return an error. If the CriticalSection is not locked then return an error. 


function CriticalSectionTryLock(CriticalSection:TCriticalSectionHandle):LongWord;
Description: Try to lock an existing CriticalSection entry
CriticalSection CriticalSection to try to lock
Return ERROR_SUCCESS if completed, ERROR_LOCKED if locked by another thread or another error code on failure
Note If the CriticalSection is not locked then lock it, set the count to one and mark the owner as the current thread. If the CriticalSection is already locked by the current thread then increment the count and return immediately. If the CriticalSection is already locked by another thread then return immediately with an error and do not wait for it to be unlocked.


Semaphore functions 

function SemaphoreCreate(Count:LongWord):TSemaphoreHandle;
Description: Create and insert a new Semaphore entry
Count The initial count of the Semaphore (Must be greater than or equal to zero)
Return Handle of new Semaphore entry or INVALID_HANDLE_VALUE if entry could not be created 


function SemaphoreCreateEx(Count,Maximum:LongWord; Flags:LongWord):TSemaphoreHandle;
Description: Create and insert a new Semaphore entry
Count The initial count of the Semaphore (Must be greater than or equal to zero)
Maximum The maximum count of the Semaphore (Must be greater than one)
Flags The flags for the Semaphore entry (eg SEMAPHORE_FLAG_IRQ)
Return Handle of new Semaphore entry or INVALID_HANDLE_VALUE if entry could not be created 


function SemaphoreDestroy(Semaphore:TSemaphoreHandle):LongWord;
Description: Destroy and remove an existing Semaphore entry
Semaphore Handle of Semaphore entry to destroy
Return ERROR_SUCCESS if completed or another error code on failure 


function SemaphoreCount(Semaphore:TSemaphoreHandle):LongWord;
Description: Get the current count of an existing Semaphore entry
Semaphore Semaphore to get count for
Return Current count or INVALID_HANDLE_VALUE on error 


function SemaphoreWait(Semaphore:TSemaphoreHandle):LongWord;
Description: Wait on an existing Semaphore entry
Semaphore Semaphore to wait on
Return ERROR_SUCCESS if completed or another error code on failure
Note If the Semaphore count is greater than zero it will be decremented and this function will return immediately. If the Semaphore count is zero the current thread will be put on a wait queue until the Semaphore is signalled by another thread calling SemaphoreSignal() or SemaphoreSignalEx(). 


function SemaphoreWaitEx(Semaphore:TSemaphoreHandle; Timeout:LongWord):LongWord;
Description: Wait on an existing Semaphore entry
Semaphore Semaphore to wait on
Timeout Milliseconds to wait before timeout (0 equals do not wait, INFINITE equals wait forever)
Return ERROR_SUCCESS if completed or another error code on failure
Note If the Semaphore count is greater than zero it will be decremented and this function will return immediately. If the Semaphore count is zero the current thread will be put on a wait queue until the Semaphore is signalled by another thread calling SemaphoreSignal() or SemaphoreSignalEx(). 


function SemaphoreSignal(Semaphore:TSemaphoreHandle):LongWord;
Description: Signal an existing Semaphore entry
Semaphore Semaphore to signal
Return ERROR_SUCCESS if completed or another error code on failure
Note If any threads are waiting on the Semaphore then one thread will be woken up and placed on the ready queue. If no threads are wait then the Semaphore count will be incremented. 


function SemaphoreSignalEx(Semaphore:TSemaphoreHandle; Count:LongWord; Previous:PLongWord):LongWord;
Description: Signal an existing Semaphore entry one or more times
Semaphore Semaphore to signal
Count The number is times to signal the Semaphore, must be greater than zero
Previous A pointer to a value that receives the previous count of the Semaphore. Can be nil if the previous count is not required
Return ERROR_SUCCESS if completed or another error code on failure
Note If any threads are waiting on the Semaphore then one thread will be woken up and placed on the ready queue for each interation of the count passed. If no threads are wait then the Semaphore count will be incremented once for each interation of the count passed.


Synchronizer functions 

function SynchronizerCreate:TSynchronizerHandle;
Description: Create and insert a new Synchronizer entry
Return Handle of new Synchronizer entry or INVALID_HANDLE_VALUE if entry could not be created 


function SynchronizerCreateEx(InitialReader,InitialWriter:Boolean):TSynchronizerHandle;
Description: Create and insert a new Synchronizer entry
InitialReader If true set the state of the synchronizer to locked and the reader count to 1
InitialWriter If true set the state of the synchronizer to locked and the writer owner to the current thread
Return Handle of new Synchronizer entry or INVALID_HANDLE_VALUE if entry could not be created 


function SynchronizerDestroy(Synchronizer:TSynchronizerHandle):LongWord;
Description: Destroy and remove an existing Synchronizer entry
Synchronizer Handle of Synchronizer entry to destroy
Return ERROR_SUCCESS if completed or another error code on failure 


function SynchronizerReaderCount(Synchronizer:TSynchronizerHandle):LongWord;
Description: Get the current reader count of an existing Synchronizer entry
Synchronizer Synchronizer to get count for
Return Current reader count or INVALID_HANDLE_VALUE on error 


function SynchronizerReaderLast(Synchronizer:TSynchronizerHandle):TThreadHandle;
Description: Get the last reader thread of an existing Synchronizer entry
Synchronizer Synchronizer to last reader for
Return Last reader thread or INVALID_HANDLE_VALUE on error 


function SynchronizerReaderLock(Synchronizer:TSynchronizerHandle):LongWord;
Description: Lock an existing Synchronizer entry for reading
Synchronizer Synchronizer to lock
Return ERROR_SUCCESS if completed or another error code on failure
Note If the Synchronizer is not locked then lock it and set the reader count to one. If the Synchronizer is already locked for reading then increment the reader count and return immediately. If the Synchronizer is already locked for writing then wait until it is unlocked. 


function SynchronizerReaderLockEx(Synchronizer:TSynchronizerHandle; Timeout:LongWord):LongWord;
Description: Lock an existing Synchronizer entry for reading
Synchronizer Synchronizer to lock
Timeout Milliseconds to wait before timeout (0 equals do not wait, INFINITE equals wait forever)
Return ERROR_SUCCESS if completed or another error code on failure
Note If the Synchronizer is not locked then lock it and set the reader count to one. If the Synchronizer is already locked for reading then increment the reader count and return immediately. If the Synchronizer is already locked for writing then wait until it is unlocked. 


function SynchronizerReaderUnlock(Synchronizer:TSynchronizerHandle):LongWord;
Description: Unlock an existing Synchronizer entry
Synchronizer Synchronizer to unlock
Return ERROR_SUCCESS if completed or another error code on failure
Note If the Synchronizer is locked for reading then decrement the count. If the count is greater than zero then return immediately. If the count reaches zero then unlock the Synchronizer and release the first writer thread waiting for it to be unlocked. If the Synchronizer is locked for writing then return an error. If the Synchronizer is not locked then return an error. 


function SynchronizerReaderConvert(Synchronizer:TSynchronizerHandle):LongWord;
Description: Convert a reader lock on an existing Synchronizer entry to a writer lock
Synchronizer Synchronizer to convert
Return ERROR_SUCCESS if completed or another error code on failure
Note If the Synchronizer is locked for reading then decrement the count. If the count is greater than zero then wait to acquire the writer lock. If the count reaches zero then convert to writer lock with the current thread as the owner. If the Synchronizer is locked for writing then return an error. If the Synchronizer is not locked then return an error. Since reader locks are recursive but do not maintain reader thread ownership, caller must ensure that one and only one reader lock is held by the current thread. 


function SynchronizerReaderConvertEx(Synchronizer:TSynchronizerHandle; Timeout:LongWord):LongWord;
Description: Convert a reader lock on an existing Synchronizer entry to a writer lock
Synchronizer Synchronizer to convert
Timeout Milliseconds to wait before timeout (0 equals do not wait, INFINITE equals wait forever)
Return ERROR_SUCCESS if completed or another error code on failure
Note If the Synchronizer is locked for reading then decrement the count. If the count is greater than zero then wait to acquire the writer lock. If the count reaches zero then convert to writer lock with the current thread as the owner. If the Synchronizer is locked for writing then return an error. If the Synchronizer is not locked then return an error. Since reader locks are recursive but do not maintain reader thread ownership, caller must ensure that one and only one reader lock is held by the current thread. 


function SynchronizerWriterCount(Synchronizer:TSynchronizerHandle):LongWord;
Description: Get the current writer count of an existing Synchronizer entry
Synchronizer Synchronizer to get count for
Return Current writer count or INVALID_HANDLE_VALUE on error 


function SynchronizerWriterOwner(Synchronizer:TSynchronizerHandle):TThreadHandle;
Description: Get the current writer owner of an existing Synchronizer entry
Synchronizer Synchronizer to get owner for
Return Handle of owning thread or INVALID_HANDLE_VALUE if not currently owned 


function SynchronizerWriterLock(Synchronizer:TSynchronizerHandle):LongWord;
Description: Lock an existing Synchronizer entry for writing
Synchronizer Synchronizer to lock
Return ERROR_SUCCESS if completed or another error code on failure
Note If the Synchronizer is not locked then lock it, set the writer count to one and mark the owner as the current thread. If the Synchronizer is already locked by the current thread then increment the writer count and return immediately. If the Synchronizer is already locked for reading then wait until it is unlocked. 


function SynchronizerWriterLockEx(Synchronizer:TSynchronizerHandle; Timeout:LongWord):LongWord;
Description: Lock an existing Synchronizer entry for writing
Synchronizer Synchronizer to lock
Timeout Milliseconds to wait before timeout (0 equals do not wait, INFINITE equals wait forever)
Return ERROR_SUCCESS if completed or another error code on failure
Note If the Synchronizer is not locked then lock it, set the writer count to one and mark the owner as the current thread. If the Synchronizer is already locked by the current thread then increment the writer count and return immediately. If the Synchronizer is already locked for reading then wait until it is unlocked. 


function SynchronizerWriterUnlock(Synchronizer:TSynchronizerHandle):LongWord;
Description: Unlock an existing Synchronizer entry
Synchronizer Synchronizer to unlock
Return ERROR_SUCCESS if completed or another error code on failure
Note If the Synchronizer is locked for writing by the current thread then decrement the count. If the count is greater than zero then return immediately. If the count reaches zero then unlock the Synchronizer and release all reader threads waiting for it to be unlocked or the first writer thread waiting for it to be unlocked. If the Synchronizer is locked for reading then return an error. If the Synchronizer is locked for writing by another thread then return an error. If the Synchronizer is not locked then return an error. 


function SynchronizerWriterConvert(Synchronizer:TSynchronizerHandle):LongWord;
Description: Convert a writer lock on an existing Synchronizer entry to a reader lock
Synchronizer Synchronizer to convert
Return ERROR_SUCCESS if completed or another error code on failure
Note If the Synchronizer is locked for writing by the current thread and the count is one then decrement the count. If the count is greater than one then return an error. If the count reaches zero then convert to reader lock and release all waiting reader threads. If the Synchronizer is locked for reading then return an error. If the Synchronizer is not locked then return an error. Since writer locks are recursive, caller must ensure that one and only one writer lock is held by the current thread.


List functions 

function ListCreate:TListHandle;
Description: Create and insert a new List entry
Return Handle of new List entry or INVALID_HANDLE_VALUE if entry could not be created 


function ListCreateEx(ListType:LongWord; Flags:LongWord):TListHandle;
Description: Create and insert a new List entry
ListType Type of list to create (eg LIST_TYPE_WAIT_SEMAPHORE)
Flags Flags for the new list (eg LIST_FLAG_IRQ)
Return Handle of new List entry or INVALID_HANDLE_VALUE if entry could not be created 


function ListDestroy(List:TListHandle):LongWord;
Description: Destroy and remove an existing List entry
List Handle of List entry to destroy
Return ERROR_SUCCESS if completed or another error code on failure
Note If list is part of a synchronisation object then caller must hold the lock on the object containing the list


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