Thread private data support

Functions
void	__kmpc_copyprivate (ident_t *loc, kmp_int32 gtid, size_t cpy_size, void *cpy_data, void(*cpy_func)(void *, void *), kmp_int32 didit)
void	__kmpc_threadprivate_register (ident_t *loc, void *data, kmpc_ctor ctor, kmpc_cctor cctor, kmpc_dtor dtor)
void *	__kmpc_threadprivate_cached (ident_t *loc, kmp_int32 global_tid, void *data, size_t size, void ***cache)
void	__kmpc_threadprivate_register_vec (ident_t *loc, void *data, kmpc_ctor_vec ctor, kmpc_cctor_vec cctor, kmpc_dtor_vec dtor, size_t vector_length)
typedef void *(*	kmpc_ctor) (void *)
typedef void(*	kmpc_dtor) (void *)
typedef void *(*	kmpc_cctor) (void *, void *)
typedef void *(*	kmpc_ctor_vec) (void *, size_t)
typedef void(*	kmpc_dtor_vec) (void *, size_t)
typedef void *(*	kmpc_cctor_vec) (void *, void *, size_t)

Detailed Description

These functions support copyin/out and thread private data.

Typedef Documentation

kmpc_cctor

typedef void*(* kmpc_cctor) (void *, void *)

Pointer to an alternate constructor. The first argument is the this pointer.

Definition at line 1430 of file kmp.h.

kmpc_cctor_vec

typedef void*(* kmpc_cctor_vec) (void *, void *, size_t)

Array constructor. First argument is the this pointer Third argument the number of array elements.

Definition at line 1452 of file kmp.h.

kmpc_ctor

typedef void*(* kmpc_ctor) (void *)

Pointer to the constructor function. The first argument is the this pointer

Definition at line 1417 of file kmp.h.

kmpc_ctor_vec

typedef void*(* kmpc_ctor_vec) (void *, size_t)

Array constructor. First argument is the this pointer Second argument the number of array elements.

Definition at line 1440 of file kmp.h.

kmpc_dtor

typedef void(* kmpc_dtor) (void *)

Pointer to the destructor function. The first argument is the this pointer

Definition at line 1423 of file kmp.h.

kmpc_dtor_vec

typedef void(* kmpc_dtor_vec) (void *, size_t)

Pointer to the array destructor function. The first argument is the this pointer Second argument the number of array elements.

Definition at line 1446 of file kmp.h.

Function Documentation

__kmpc_copyprivate()

void __kmpc_copyprivate	(	ident_t *	loc,
		kmp_int32	gtid,
		size_t	cpy_size,
		void *	cpy_data,
		void(*)(void *, void *)	cpy_func,
		kmp_int32	didit
	)

Parameters

loc	source location information
gtid	global thread number
cpy_size	size of the cpy_data buffer
cpy_data	pointer to data to be copied
cpy_func	helper function to call for copying data
didit	flag variable: 1=single thread; 0=not single thread

__kmpc_copyprivate implements the interface for the private data broadcast needed for the copyprivate clause associated with a single region in an OpenMP^* program (both C and Fortran). All threads participating in the parallel region call this routine. One of the threads (called the single thread) should have the didit variable set to 1 and all other threads should have that variable set to 0. All threads pass a pointer to a data buffer (cpy_data) that they have built.

The OpenMP specification forbids the use of nowait on the single region when a copyprivate clause is present. However, __kmpc_copyprivate implements a barrier internally to avoid race conditions, so the code generation for the single region should avoid generating a barrier after the call to __kmpc_copyprivate.

The gtid parameter is the global thread id for the current thread. The loc parameter is a pointer to source location information.

Internal implementation: The single thread will first copy its descriptor address (cpy_data) to a team-private location, then the other threads will each call the function pointed to by the parameter cpy_func, which carries out the copy by copying the data using the cpy_data buffer.

The cpy_func routine used for the copy and the contents of the data area defined by cpy_data and cpy_size may be built in any fashion that will allow the copy to be done. For instance, the cpy_data buffer can hold the actual data to be copied or it may hold a list of pointers to the data. The cpy_func routine must interpret the cpy_data buffer appropriately.

The interface to cpy_func is as follows:

void cpy_func( void *destination, void *source )

where void *destination is the cpy_data pointer for the thread being copied to and void *source is the cpy_data pointer for the thread being copied from.

Definition at line 2065 of file kmp_csupport.cpp.

__kmpc_threadprivate_cached()

void* __kmpc_threadprivate_cached	(	ident_t *	loc,
		kmp_int32	global_tid,
		void *	data,
		size_t	size,
		void ***	cache
	)

Parameters

loc	source location information
global_tid	global thread number
data	pointer to data to privatize
size	size of data to privatize
cache	pointer to cache

Returns

pointer to private storage

Allocate private storage for threadprivate data.

Definition at line 615 of file kmp_threadprivate.cpp.

__kmpc_threadprivate_register()

void __kmpc_threadprivate_register	(	ident_t *	loc,
		void *	data,
		kmpc_ctor	ctor,
		kmpc_cctor	cctor,
		kmpc_dtor	dtor
	)

Parameters

loc	source location information
data	pointer to data being privatized
ctor	pointer to constructor function for data
cctor	pointer to copy constructor function for data
dtor	pointer to destructor function for data

Register constructors and destructors for thread private data. This function is called when executing in parallel, when we know the thread id.

Definition at line 505 of file kmp_threadprivate.cpp.

__kmpc_threadprivate_register_vec()

void __kmpc_threadprivate_register_vec	(	ident_t *	loc,
		void *	data,
		kmpc_ctor_vec	ctor,
		kmpc_cctor_vec	cctor,
		kmpc_dtor_vec	dtor,
		size_t	vector_length
	)

Parameters

loc	source location information
data	pointer to data being privatized
ctor	pointer to constructor function for data
cctor	pointer to copy constructor function for data
dtor	pointer to destructor function for data
vector_length	length of the vector (bytes or elements?) Register vector constructors and destructors for thread private data.

Definition at line 747 of file kmp_threadprivate.cpp.