Summary of Intel® Cilk™ Plus Language Features

Intel® Cilk™ Plus provides a number of related elements such as keywords, command line options, environment variables and pragmas. The following table provides a summary.

Element	Description
Keywords:
_Cilk_spawn	Modifies a function call statement to tell the runtime system that the function may (but is not required to) run in parallel with the caller. See cilk_spawn.
_Cilk_sync	Indicates that the current function cannot continue past this point in parallel with its spawned children. See cilk_sync.
_Cilk_for	Specifies a loop that permits loop iterations to run in parallel; is a replacement for the normal C/C++ for loop. This statement divides a loop into chunks containing one or more loop iterations. Each chunk is executed serially, and is spawned as a chunk during the execution of the loop. See cilk_for.
Pragmas:
cilk grainsize	Specifies the grain size for one cilk_for loop. See cilk_for.
simd	Expresses vector parallelism for utilizing hardware SIMD parallelism. See simd.
Predefined Macro:
__cilk	Specifies the supported Intel® Cilk™ Plus version number. The value is set at 200 for this release. If this macro is not defined, the compiler does not support Intel® Cilk™ Plus.
Environment Variable:
CILK_NWORKERS	Specifies the number of worker threads . See Set Worker Count.
Elemental Function:
declspec(vector)	Used to write an elemental function. See Elemental Functions.
Compiler Options:
/Qcilk-serialize, -cilk-serialize	Specifies that a Intel® Cilk™ Plus program should be serialized. See Serialization.
/Qintel-extensions[-], -[no]intel-extensions	Enables or disables Intel language extensions (which include Intel® Cilk™ Plus). Intel language extensions are on by default.
Header files (located in include/cilk):
cilk/cilk.h	Defines macros that provide names with simpler conventions (cilk_spawn, cilk_sync and cilk_for) .
cilk/cilk_api.h	Declares the runtime functions and classes.
cilk/cilk_stub.h	Can be used to serialize an Intel® Cilk™ Plus application .
cilk/holder.h	Contains the definition of the cilk::holder template. See Introduction to Holders.
cilk/reducer.h	Contains common reducer definitions. See Introduction to Reducers.
reducer_list.h reducer_max.h reducer_min.h reducer_opadd.h reducer_opand.h reducer_opor.h reducer_opxor.h reducer_ostream.h reducer_string.h	Reducers provided in the reducer library. See Reducer Library.