[mirror_edk2.git] / MdePkg / Include / Library / SynchronizationLib.h

/** @file\r
  Provides synchronization functions.\r
\r
Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#ifndef __SYNCHRONIZATION_LIB__\r
#define __SYNCHRONIZATION_LIB__\r
\r
///\r
/// Definitions for SPIN_LOCK\r
///\r
typedef volatile UINTN              SPIN_LOCK;\r
\r
\r
/**\r
  Retrieves the architecture-specific spin lock alignment requirements for\r
  optimal spin lock performance.\r
\r
  This function retrieves the spin lock alignment requirements for optimal\r
  performance on a given CPU architecture. The spin lock alignment is byte alignment. \r
  It must be a power of two and is returned by this function. If there are no alignment\r
  requirements, then 1 must be returned. The spin lock synchronization\r
  functions must function correctly if the spin lock size and alignment values\r
  returned by this function are not used at all. These values are hints to the\r
  consumers of the spin lock synchronization functions to obtain optimal spin\r
  lock performance.\r
\r
  @return The architecture-specific spin lock alignment.\r
\r
**/\r
UINTN\r
EFIAPI\r
GetSpinLockProperties (\r
  VOID\r
  );\r
\r
\r
/**\r
  Initializes a spin lock to the released state and returns the spin lock.\r
\r
  This function initializes the spin lock specified by SpinLock to the released\r
  state, and returns SpinLock. Optimal performance can be achieved by calling\r
  GetSpinLockProperties() to determine the size and alignment requirements for\r
  SpinLock.\r
\r
  If SpinLock is NULL, then ASSERT().\r
\r
  @param  SpinLock  A pointer to the spin lock to initialize to the released\r
                    state.\r
\r
  @return SpinLock in release state.\r
\r
**/\r
SPIN_LOCK *\r
EFIAPI\r
InitializeSpinLock (\r
  OUT      SPIN_LOCK                 *SpinLock\r
  );\r
\r
\r
/**\r
  Waits until a spin lock can be placed in the acquired state.\r
\r
  This function checks the state of the spin lock specified by SpinLock. If\r
  SpinLock is in the released state, then this function places SpinLock in the\r
  acquired state and returns SpinLock. Otherwise, this function waits\r
  indefinitely for the spin lock to be released, and then places it in the\r
  acquired state and returns SpinLock. All state transitions of SpinLock must\r
  be performed using MP safe mechanisms.\r
\r
  If SpinLock is NULL, then ASSERT().\r
  If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().\r
  If PcdSpinLockTimeout is not zero, and SpinLock is can not be acquired in\r
  PcdSpinLockTimeout microseconds, then ASSERT().\r
\r
  @param  SpinLock  A pointer to the spin lock to place in the acquired state.\r
\r
  @return SpinLock acquired lock.\r
\r
**/\r
SPIN_LOCK *\r
EFIAPI\r
AcquireSpinLock (\r
  IN OUT  SPIN_LOCK                 *SpinLock\r
  );\r
\r
\r
/**\r
  Attempts to place a spin lock in the acquired state.\r
\r
  This function checks the state of the spin lock specified by SpinLock. If\r
  SpinLock is in the released state, then this function places SpinLock in the\r
  acquired state and returns TRUE. Otherwise, FALSE is returned. All state\r
  transitions of SpinLock must be performed using MP safe mechanisms.\r
\r
  If SpinLock is NULL, then ASSERT().\r
  If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().\r
\r
  @param  SpinLock  A pointer to the spin lock to place in the acquired state.\r
\r
  @retval TRUE  SpinLock was placed in the acquired state.\r
  @retval FALSE SpinLock could not be acquired.\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
AcquireSpinLockOrFail (\r
  IN OUT  SPIN_LOCK                 *SpinLock\r
  );\r
\r
\r
/**\r
  Releases a spin lock.\r
\r
  This function places the spin lock specified by SpinLock in the release state\r
  and returns SpinLock.\r
\r
  If SpinLock is NULL, then ASSERT().\r
  If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().\r
\r
  @param  SpinLock  A pointer to the spin lock to release.\r
\r
  @return SpinLock released lock.\r
\r
**/\r
SPIN_LOCK *\r
EFIAPI\r
ReleaseSpinLock (\r
  IN OUT  SPIN_LOCK                 *SpinLock\r
  );\r
\r
\r
/**\r
  Performs an atomic increment of a 32-bit unsigned integer.\r
\r
  Performs an atomic increment of the 32-bit unsigned integer specified by\r
  Value and returns the incremented value. The increment operation must be\r
  performed using MP safe mechanisms. The state of the return value is not\r
  guaranteed to be MP safe.\r
\r
  If Value is NULL, then ASSERT().\r
\r
  @param  Value A pointer to the 32-bit value to increment.\r
\r
  @return The incremented value.\r
\r
**/\r
UINT32\r
EFIAPI\r
InterlockedIncrement (\r
  IN      UINT32                    *Value\r
  );\r
\r
\r
/**\r
  Performs an atomic decrement of a 32-bit unsigned integer.\r
\r
  Performs an atomic decrement of the 32-bit unsigned integer specified by\r
  Value and returns the decremented value. The decrement operation must be\r
  performed using MP safe mechanisms. The state of the return value is not\r
  guaranteed to be MP safe.\r
\r
  If Value is NULL, then ASSERT().\r
\r
  @param  Value A pointer to the 32-bit value to decrement.\r
\r
  @return The decremented value.\r
\r
**/\r
UINT32\r
EFIAPI\r
InterlockedDecrement (\r
  IN      UINT32                    *Value\r
  );\r
\r
\r
/**\r
  Performs an atomic compare exchange operation on a 16-bit unsigned integer.\r
\r
  Performs an atomic compare exchange operation on the 16-bit unsigned integer\r
  specified by Value.  If Value is equal to CompareValue, then Value is set to\r
  ExchangeValue and CompareValue is returned.  If Value is not equal to CompareValue,\r
  then Value is returned.  The compare exchange operation must be performed using\r
  MP safe mechanisms.\r
\r
  If Value is NULL, then ASSERT().\r
\r
  @param  Value         A pointer to the 16-bit value for the compare exchange\r
                        operation.\r
  @param  CompareValue  16-bit value used in compare operation.\r
  @param  ExchangeValue 16-bit value used in exchange operation.\r
\r
  @return The original *Value before exchange.\r
**/\r
UINT16\r
EFIAPI\r
InterlockedCompareExchange16 (\r
  IN OUT  UINT16                    *Value,\r
  IN      UINT16                    CompareValue,\r
  IN      UINT16                    ExchangeValue\r
  );\r
\r
/**\r
  Performs an atomic compare exchange operation on a 32-bit unsigned integer.\r
\r
  Performs an atomic compare exchange operation on the 32-bit unsigned integer\r
  specified by Value.  If Value is equal to CompareValue, then Value is set to\r
  ExchangeValue and CompareValue is returned.  If Value is not equal to CompareValue,\r
  then Value is returned.  The compare exchange operation must be performed using\r
  MP safe mechanisms.\r
\r
  If Value is NULL, then ASSERT().\r
\r
  @param  Value         A pointer to the 32-bit value for the compare exchange\r
                        operation.\r
  @param  CompareValue  32-bit value used in compare operation.\r
  @param  ExchangeValue 32-bit value used in exchange operation.\r
\r
  @return The original *Value before exchange.\r
\r
**/\r
UINT32\r
EFIAPI\r
InterlockedCompareExchange32 (\r
  IN OUT  UINT32                    *Value,\r
  IN      UINT32                    CompareValue,\r
  IN      UINT32                    ExchangeValue\r
  );\r
\r
\r
/**\r
  Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r
\r
  Performs an atomic compare exchange operation on the 64-bit unsigned integer specified\r
  by Value.  If Value is equal to CompareValue, then Value is set to ExchangeValue and\r
  CompareValue is returned.  If Value is not equal to CompareValue, then Value is returned.\r
  The compare exchange operation must be performed using MP safe mechanisms.\r
\r
  If Value is NULL, then ASSERT().\r
\r
  @param  Value         A pointer to the 64-bit value for the compare exchange\r
                        operation.\r
  @param  CompareValue  64-bit value used in compare operation.\r
  @param  ExchangeValue 64-bit value used in exchange operation.\r
\r
  @return The original *Value before exchange.\r
\r
**/\r
UINT64\r
EFIAPI\r
InterlockedCompareExchange64 (\r
  IN OUT  UINT64                    *Value,\r
  IN      UINT64                    CompareValue,\r
  IN      UINT64                    ExchangeValue\r
  );\r
\r
\r
/**\r
  Performs an atomic compare exchange operation on a pointer value.\r
\r
  Performs an atomic compare exchange operation on the pointer value specified\r
  by Value. If Value is equal to CompareValue, then Value is set to\r
  ExchangeValue and CompareValue is returned. If Value is not equal to\r
  CompareValue, then Value is returned. The compare exchange operation must be\r
  performed using MP safe mechanisms.\r
\r
  If Value is NULL, then ASSERT().\r
\r
  @param  Value         A pointer to the pointer value for the compare exchange\r
                        operation.\r
  @param  CompareValue  Pointer value used in compare operation.\r
  @param  ExchangeValue Pointer value used in exchange operation.\r
\r
  @return The original *Value before exchange.\r
**/\r
VOID *\r
EFIAPI\r
InterlockedCompareExchangePointer (\r
  IN OUT  VOID                      **Value,\r
  IN      VOID                      *CompareValue,\r
  IN      VOID                      *ExchangeValue\r
  );\r
\r
#endif\r
\r
\r
Commit	Line	Data
720d3c5f	1	/** @file\r
	2	Provides synchronization functions.\r
	3	\r
744265eb	4	Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>\r
9df063a0	5	This program and the accompanying materials\r
720d3c5f	6	are licensed and made available under the terms and conditions of the BSD License\r
	7	which accompanies this distribution. The full text of the license may be found at\r
	8	http://opensource.org/licenses/bsd-license.php\r
	9	\r
	10	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	12	\r
	13	**/\r
	14	\r
	15	#ifndef __SYNCHRONIZATION_LIB__\r
	16	#define __SYNCHRONIZATION_LIB__\r
	17	\r
	18	///\r
	19	/// Definitions for SPIN_LOCK\r
	20	///\r
	21	typedef volatile UINTN SPIN_LOCK;\r
	22	\r
	23	\r
	24	/**\r
1a2f870c	25	Retrieves the architecture-specific spin lock alignment requirements for\r
720d3c5f	26	optimal spin lock performance.\r
	27	\r
	28	This function retrieves the spin lock alignment requirements for optimal\r
744265eb LG	29	performance on a given CPU architecture. The spin lock alignment is byte alignment. \r
744265eb LG	30	It must be a power of two and is returned by this function. If there are no alignment\r
720d3c5f	31	requirements, then 1 must be returned. The spin lock synchronization\r
	32	functions must function correctly if the spin lock size and alignment values\r
	33	returned by this function are not used at all. These values are hints to the\r
	34	consumers of the spin lock synchronization functions to obtain optimal spin\r
	35	lock performance.\r
	36	\r
1a2f870c	37	@return The architecture-specific spin lock alignment.\r
720d3c5f	38	\r
	39	**/\r
	40	UINTN\r
	41	EFIAPI\r
	42	GetSpinLockProperties (\r
	43	VOID\r
	44	);\r
	45	\r
	46	\r
	47	/**\r
	48	Initializes a spin lock to the released state and returns the spin lock.\r
	49	\r
	50	This function initializes the spin lock specified by SpinLock to the released\r
	51	state, and returns SpinLock. Optimal performance can be achieved by calling\r
	52	GetSpinLockProperties() to determine the size and alignment requirements for\r
	53	SpinLock.\r
	54	\r
	55	If SpinLock is NULL, then ASSERT().\r
	56	\r
	57	@param SpinLock A pointer to the spin lock to initialize to the released\r
	58	state.\r
	59	\r
	60	@return SpinLock in release state.\r
	61	\r
	62	**/\r
	63	SPIN_LOCK *\r
	64	EFIAPI\r
	65	InitializeSpinLock (\r
	66	OUT SPIN_LOCK *SpinLock\r
	67	);\r
	68	\r
	69	\r
	70	/**\r
	71	Waits until a spin lock can be placed in the acquired state.\r
	72	\r
	73	This function checks the state of the spin lock specified by SpinLock. If\r
	74	SpinLock is in the released state, then this function places SpinLock in the\r
	75	acquired state and returns SpinLock. Otherwise, this function waits\r
	76	indefinitely for the spin lock to be released, and then places it in the\r
	77	acquired state and returns SpinLock. All state transitions of SpinLock must\r
	78	be performed using MP safe mechanisms.\r
	79	\r
	80	If SpinLock is NULL, then ASSERT().\r
	81	If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().\r
	82	If PcdSpinLockTimeout is not zero, and SpinLock is can not be acquired in\r
	83	PcdSpinLockTimeout microseconds, then ASSERT().\r
	84	\r
	85	@param SpinLock A pointer to the spin lock to place in the acquired state.\r
	86	\r
	87	@return SpinLock acquired lock.\r
	88	\r
	89	**/\r
	90	SPIN_LOCK *\r
	91	EFIAPI\r
	92	AcquireSpinLock (\r
	93	IN OUT SPIN_LOCK *SpinLock\r
	94	);\r
	95	\r
	96	\r
	97	/**\r
	98	Attempts to place a spin lock in the acquired state.\r
	99	\r
	100	This function checks the state of the spin lock specified by SpinLock. If\r
	101	SpinLock is in the released state, then this function places SpinLock in the\r
102	acquired state and returns TRUE. Otherwise, FALSE is returned. All state\r
103	transitions of SpinLock must be performed using MP safe mechanisms.\r
104	\r
105	If SpinLock is NULL, then ASSERT().\r
106	If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().\r
107	\r
108	@param SpinLock A pointer to the spin lock to place in the acquired state.\r
109	\r
110	@retval TRUE SpinLock was placed in the acquired state.\r
111	@retval FALSE SpinLock could not be acquired.\r
112	\r
113	**/\r
114	BOOLEAN\r
115	EFIAPI\r
116	AcquireSpinLockOrFail (\r
117	IN OUT SPIN_LOCK *SpinLock\r
118	);\r
119	\r
120	\r
121	/**\r
122	Releases a spin lock.\r
123	\r
124	This function places the spin lock specified by SpinLock in the release state\r
125	and returns SpinLock.\r
126	\r
127	If SpinLock is NULL, then ASSERT().\r
128	If SpinLock was not initialized with InitializeSpinLock(), then ASSERT().\r
129	\r
130	@param SpinLock A pointer to the spin lock to release.\r
131	\r
132	@return SpinLock released lock.\r
133	\r
134	**/\r
135	SPIN_LOCK *\r
136	EFIAPI\r
137	ReleaseSpinLock (\r
138	IN OUT SPIN_LOCK *SpinLock\r
139	);\r
140	\r
141	\r
142	/**\r
1a2f870c	143	Performs an atomic increment of a 32-bit unsigned integer.\r
720d3c5f	144	\r
	145	Performs an atomic increment of the 32-bit unsigned integer specified by\r
	146	Value and returns the incremented value. The increment operation must be\r
	147	performed using MP safe mechanisms. The state of the return value is not\r
	148	guaranteed to be MP safe.\r
	149	\r
	150	If Value is NULL, then ASSERT().\r
	151	\r
	152	@param Value A pointer to the 32-bit value to increment.\r
	153	\r
	154	@return The incremented value.\r
	155	\r
	156	**/\r
	157	UINT32\r
	158	EFIAPI\r
	159	InterlockedIncrement (\r
	160	IN UINT32 *Value\r
	161	);\r
	162	\r
	163	\r
	164	/**\r
1a2f870c	165	Performs an atomic decrement of a 32-bit unsigned integer.\r
720d3c5f	166	\r
	167	Performs an atomic decrement of the 32-bit unsigned integer specified by\r
	168	Value and returns the decremented value. The decrement operation must be\r
	169	performed using MP safe mechanisms. The state of the return value is not\r
	170	guaranteed to be MP safe.\r
	171	\r
	172	If Value is NULL, then ASSERT().\r
	173	\r
	174	@param Value A pointer to the 32-bit value to decrement.\r
	175	\r
	176	@return The decremented value.\r
	177	\r
	178	**/\r
	179	UINT32\r
	180	EFIAPI\r
	181	InterlockedDecrement (\r
	182	IN UINT32 *Value\r
	183	);\r
	184	\r
	185	\r
9b89163e AB	186	/**\r
	187	Performs an atomic compare exchange operation on a 16-bit unsigned integer.\r
	188	\r
	189	Performs an atomic compare exchange operation on the 16-bit unsigned integer\r
	190	specified by Value. If Value is equal to CompareValue, then Value is set to\r
	191	ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,\r
	192	then Value is returned. The compare exchange operation must be performed using\r
	193	MP safe mechanisms.\r
	194	\r
	195	If Value is NULL, then ASSERT().\r
	196	\r
	197	@param Value A pointer to the 16-bit value for the compare exchange\r
	198	operation.\r
	199	@param CompareValue 16-bit value used in compare operation.\r
	200	@param ExchangeValue 16-bit value used in exchange operation.\r
	201	\r
	202	@return The original *Value before exchange.\r
	203	**/\r
	204	UINT16\r
	205	EFIAPI\r
	206	InterlockedCompareExchange16 (\r
	207	IN OUT UINT16 *Value,\r
	208	IN UINT16 CompareValue,\r
	209	IN UINT16 ExchangeValue\r
	210	);\r
	211	\r
720d3c5f	212	/**\r
	213	Performs an atomic compare exchange operation on a 32-bit unsigned integer.\r
	214	\r
	215	Performs an atomic compare exchange operation on the 32-bit unsigned integer\r
	216	specified by Value. If Value is equal to CompareValue, then Value is set to\r
	217	ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,\r
	218	then Value is returned. The compare exchange operation must be performed using\r
	219	MP safe mechanisms.\r
	220	\r
	221	If Value is NULL, then ASSERT().\r
	222	\r
	223	@param Value A pointer to the 32-bit value for the compare exchange\r
	224	operation.\r
	225	@param CompareValue 32-bit value used in compare operation.\r
	226	@param ExchangeValue 32-bit value used in exchange operation.\r
	227	\r
	228	@return The original *Value before exchange.\r
	229	\r
	230	**/\r
	231	UINT32\r
	232	EFIAPI\r
	233	InterlockedCompareExchange32 (\r
	234	IN OUT UINT32 *Value,\r
	235	IN UINT32 CompareValue,\r
	236	IN UINT32 ExchangeValue\r
	237	);\r
	238	\r
	239	\r
	240	/**\r
	241	Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r
	242	\r
	243	Performs an atomic compare exchange operation on the 64-bit unsigned integer specified\r
	244	by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and\r
	245	CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.\r
	246	The compare exchange operation must be performed using MP safe mechanisms.\r
	247	\r
	248	If Value is NULL, then ASSERT().\r
	249	\r
	250	@param Value A pointer to the 64-bit value for the compare exchange\r
	251	operation.\r
	252	@param CompareValue 64-bit value used in compare operation.\r
	253	@param ExchangeValue 64-bit value used in exchange operation.\r
	254	\r
	255	@return The original *Value before exchange.\r
	256	\r
	257	**/\r
	258	UINT64\r
	259	EFIAPI\r
	260	InterlockedCompareExchange64 (\r
	261	IN OUT UINT64 *Value,\r
	262	IN UINT64 CompareValue,\r
	263	IN UINT64 ExchangeValue\r
	264	);\r
	265	\r
	266	\r
	267	/**\r
	268	Performs an atomic compare exchange operation on a pointer value.\r
	269	\r
	270	Performs an atomic compare exchange operation on the pointer value specified\r
	271	by Value. If Value is equal to CompareValue, then Value is set to\r
	272	ExchangeValue and CompareValue is returned. If Value is not equal to\r
	273	CompareValue, then Value is returned. The compare exchange operation must be\r
	274	performed using MP safe mechanisms.\r
	275	\r
276	If Value is NULL, then ASSERT().\r
277	\r
278	@param Value A pointer to the pointer value for the compare exchange\r
279	operation.\r
280	@param CompareValue Pointer value used in compare operation.\r
281	@param ExchangeValue Pointer value used in exchange operation.\r
282	\r
283	@return The original *Value before exchange.\r
284	**/\r
285	VOID *\r
286	EFIAPI\r
287	InterlockedCompareExchangePointer (\r
288	IN OUT VOID **Value,\r
289	IN VOID *CompareValue,\r
290	IN VOID *ExchangeValue\r
291	);\r
292	\r
293	#endif\r
294	\r
295	\r