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How to periodically execute a function in C ??
Post 302152470 by WebKruncher on Thursday 20th of December 2007 12:41:28 AM
12-20-2007
Great feedback!
This might be about the coolest site I've ever seen. Anyway, diplomacy is over-rated 
I don't disagree at all about the performance hit. I came up with the C++ object just to pack all of whatever it's gonna do into something that can be tucked away in a generic library and offer an easy way to trigger something. I like it because it keeps all the dirty work of checking the clock out of the main code. So, the utility can look something like:
// xxx is each of sound, graphics_cache, file_activity, port_status, whatever_else
struct xxx_Manager : Chronisitcs
{
xxx_Manager(int ms) : Chronistics(ms) {}
virtual bool operator()();
}
bool xxx_Manager:
perator()()
{
if (!trigger()) return false;
// it's time to do whatever an xxx manager should do
return true;
}
while (1)
{
// just do whatever you normally do...
// each line turns out to be a function object based on the Chonistics thingy
sound_manager();
graphic_cache_manager();
geometry_manager();
collision_manager();
file_activity_manager();
port_status_manager();
magic_spell_manager();
socket_service_manager();
whatever_else_manager();
// probably need some kind of system call here or you'll tank.
// usually a short sleep does the trick.
usleep(10);
}
...and all the logic of determining when to actually do the stuff is handled in the Chronistic guts. However it's done, it happens exactly the same way for every Chronistic derivative. And, of course then, you can have stacks and deques and maps of managed objects, and traverse them, sort them, update them in whatever order you want, index them, well, you get the point. It can get pretty interesting.
But, what I really want to know is, what is the best way to get the kernel to signal something periodically. And, can it be done without a worker thread?
I don't disagree at all about the performance hit. I came up with the C++ object just to pack all of whatever it's gonna do into something that can be tucked away in a generic library and offer an easy way to trigger something. I like it because it keeps all the dirty work of checking the clock out of the main code. So, the utility can look something like:
// xxx is each of sound, graphics_cache, file_activity, port_status, whatever_else
struct xxx_Manager : Chronisitcs
{
xxx_Manager(int ms) : Chronistics(ms) {}
virtual bool operator()();
}
bool xxx_Manager:
perator()(){
if (!trigger()) return false;
// it's time to do whatever an xxx manager should do
return true;
}
while (1)
{
// just do whatever you normally do...
// each line turns out to be a function object based on the Chonistics thingy
sound_manager();
graphic_cache_manager();
geometry_manager();
collision_manager();
file_activity_manager();
port_status_manager();
magic_spell_manager();
socket_service_manager();
whatever_else_manager();
// probably need some kind of system call here or you'll tank.
// usually a short sleep does the trick.
usleep(10);
}
...and all the logic of determining when to actually do the stuff is handled in the Chronistic guts. However it's done, it happens exactly the same way for every Chronistic derivative. And, of course then, you can have stacks and deques and maps of managed objects, and traverse them, sort them, update them in whatever order you want, index them, well, you get the point. It can get pretty interesting.
But, what I really want to know is, what is the best way to get the kernel to signal something periodically. And, can it be done without a worker thread?
Last edited by WebKruncher; 12-20-2007 at 02:12 AM..
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LEARN ABOUT CENTOS
std::tr2::bool_set
std::tr2::bool_set(3) Library Functions Manual std::tr2::bool_set(3) NAME
std::tr2::bool_set - SYNOPSIS
Public Member Functions constexpr bool_set () constexpr bool_set (bool __t) bool contains (bool_set __b) const bool equals (bool_set __b) const bool is_emptyset () const bool is_indeterminate () const bool is_singleton () const operator bool () const Static Public Member Functions static bool_set emptyset () static bool_set indeterminate () Friends bool_set operator! (bool_set __b) bool_set operator& (bool_set __s, bool_set __t) template<typename CharT , typename Traits > std::basic_ostream< CharT, Traits > & operator<< (std::basic_ostream< CharT, Traits > &__out, bool_set __b)" bool_set operator== (bool_set __s, bool_set __t) template<typename CharT , typename Traits > std::basic_istream< CharT, Traits > & operator>> (std::basic_istream< CharT, Traits > &__in, bool_set &__b)" bool_set operator^ (bool_set __s, bool_set __t) bool_set operator| (bool_set __s, bool_set __t) Detailed Description bool_set See N2136, Bool_set: multi-valued logic by Herve Bronnimann, Guillaume Melquiond, Sylvain Pion. The implicit conversion to bool is slippery! I may use the new explicit conversion. This has been specialized in the language so that in contexts requiring a bool the conversion happens implicitly. Thus most objections should be eliminated. Definition at line 54 of file bool_set. Constructor &; Destructor Documentation constexpr std::tr2::bool_set::bool_set () [inline] Default constructor. Definition at line 59 of file bool_set. constexpr std::tr2::bool_set::bool_set (bool__t) [inline] Constructor from bool. Definition at line 62 of file bool_set. Member Function Documentation bool std::tr2::bool_set::equals (bool_set__b) const [inline] Return true if states are equal. Definition at line 69 of file bool_set. bool std::tr2::bool_set::is_emptyset () const [inline] Return true if this is empty. Definition at line 73 of file bool_set. bool std::tr2::bool_set::is_indeterminate () const [inline] Return true if this is indeterminate. Definition at line 77 of file bool_set. bool std::tr2::bool_set::is_singleton () const [inline] Return true if this is false or true (normal boolean). Definition at line 81 of file bool_set. Referenced by operator bool(). std::tr2::bool_set::operator bool () const [inline] Conversion to bool. Definition at line 86 of file bool_set. References is_singleton(). Author Generated automatically by Doxygen for libstdc++ from the source code. libstdc++ Tue Jun 10 2014 std::tr2::bool_set(3)