Performance Constraints

Collaboration diagram for Performance Constraints:

Macros
#define	native_allocating
	Declares a function potentially allocates heap memory. Prevents inference of nonallocating.
#define	native_blocking
	Declares a function potentially blocks. Prevents inference of native_nonblocking.
#define	native_nonblocking
	Declares a function does not block.
#define	native_noblock(__x)
	a bool parameterized version of native_nonblocking
#define	native_nonallocating
	Declares a function does not allocate heap memory.
#define	native_noalloc(__x)
	a bool parameterized version of native_nonallocating

Detailed Description

• When assigning or otherwise converting to a function pointer of nonblocking or nonallocating type, the source must also be a function or function pointer of that type, unless it is a null pointer, i.e. the attributes should not be “spoofed”. Conversions that remove the attributes are transparent and valid.
• An override of a nonblocking or nonallocating virtual method must also be declared with that same attribute (or a stronger one.) An overriding method may add an attribute.
• A redeclaration of a nonblocking or nonallocating function must also be declared with the same attribute (or a stronger one). A redeclaration may add an attribute.

Note

native_noalloc(x) and native_noblock(x) are necessitated by the inability to write a macro that merely may take an argument.

Macro Definition Documentation

native_noalloc

#define native_noalloc

(

__x

)

a bool parameterized version of native_nonallocating

• native_noalloc(false) behaves like native_allocating.
• native_noalloc(true) behavs like native_nonallocating

Definition at line 1328 of file attributes.h.

native_noblock

#define native_noblock

(

__x

)

a bool parameterized version of native_nonblocking

• native_noblock(false) behaves like native_blocking.
• native_noblock(true) behavs like native_nonblocking

Definition at line 1329 of file attributes.h.