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trampoline

TRAMPOLINE(3)						     Library Functions Manual						     TRAMPOLINE(3)

NAME

       trampoline - closures as first-class C functions

SYNOPSIS

       #include <trampoline.h>

       function = alloc_trampoline(address, variable, data);

       free_trampoline(function);

       is_trampoline(function)
       trampoline_address(function)
       trampoline_variable(function)
       trampoline_data(function)

DESCRIPTION

       These  functions  implement closures as first-class C functions.  A closure consists of a regular C function and a piece of data which gets
       passed to the C function when the closure is called.

       Closures as first-class C functions means that they fit into a function pointer and can be called exactly like any other C function.  func-
       tion  =	alloc_trampoline(address,  variable, data) allocates a closure. When function gets called, it stores data in the variable variable
       and calls the C function at address.  The function at address is responsible for fetching data out of variable immediately,  before  execu-
       tion of any other function call.

       This  is much like gcc's local functions, except that the GNU C local functions have dynamic extent (i.e. are deallocated when the creating
       function returns), while trampoline provides functions with indefinite extent: function is only deallocated when  free_trampoline(function)
       is called.

       is_trampoline(function) checks whether the C function function was produced by a call to alloc_trampoline.  If this returns true, the argu-
       ments given to alloc_trampoline can be retrieved:

	   trampoline_address(function) returns address,

	   trampoline_variable(function) returns variable,

	   trampoline_data(function) returns data.

SEE ALSO

       gcc(1), varargs(3), callback(3)

BUGS

       Passing the data through a global variable is not reentrant. Don't call trampoline functions from within signal handlers. This is fixed	in
       the callback(3) package.

PORTING

       The way gcc builds local functions is described in the gcc source, file gcc-2.6.3/config/cpu/cpu.h.

AUTHOR

       Bruno Haible <bruno@clisp.org>

ACKNOWLEDGEMENTS

       Many ideas were cribbed from the gcc source.

								  25 October 1997						     TRAMPOLINE(3)

Solaris