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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)