remove atexit2 - explicit init and shutdown is safer and easier to understand.
add some initial docs. This was SVN commit r2008.
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@ -25,108 +25,6 @@
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#include "sysdep/sysdep.h"
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// more powerful atexit, with 0 or 1 parameters.
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// callable before libc initialized, frees up the real atexit table,
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// and often obviates a separate cleanup_everything function.
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//
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// problem: some of the functions registered here must be called after
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// all other shutdown code (e.g. Winsock cleanup).
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// we can't wedge ourselves between the regular atexit calls and
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// process termination, so hooking exit isn't possible.
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// need to use regular atexit, which must be called after _cinit.
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// AFAIK, we can't interpose ourselves between libc init and constructors
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// either, so constructors MUST NOT:
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// - exit() (otherwise, some resources leak, because our atexit handler
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// wouldn't have been registered yet - it's done from main())
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// - call atexit (our exit handler would be called before its handler,
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// so we may have shut down something important already).
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static const int MAX_EXIT_FUNCS = 32;
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static struct ExitFunc
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{
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void* func;
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uintptr_t arg;
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CallConvention cc;
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} exit_funcs[MAX_EXIT_FUNCS];
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static int num_exit_funcs;
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// call all registered exit handlers in LIFO order.
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// called from exit, so don't worry about thread safety.
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static void call_exit_funcs(void)
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{
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ExitFunc* p = exit_funcs;
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for(int i = num_exit_funcs-1; i >= 0; i--)
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{
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switch(p->cc)
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{
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case CC_CDECL_0:
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((void(*)(void))p->func)();
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break;
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case CC_CDECL_1:
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((void(*)(uintptr_t))p->func)(p->arg);
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break;
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#ifdef _WIN32
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case CC_STDCALL_0:
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((void(__stdcall*)(void))p->func)();
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break;
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case CC_STDCALL_1:
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((void(__stdcall*)(uintptr_t))p->func)(p->arg);
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break;
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#endif
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default:
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debug_warn("call_exit_funcs: invalid calling convention in ExitFunc!");
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}
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p++;
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}
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num_exit_funcs = 0;
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}
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int atexit2(void* func, uintptr_t arg, CallConvention cc)
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{
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if(num_exit_funcs >= MAX_EXIT_FUNCS)
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{
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debug_warn("atexit2: too many functions registered. increase MAX_EXIT_FUNCS");
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return -1;
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}
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ExitFunc* p = &exit_funcs[num_exit_funcs++];
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p->func = func;
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p->arg = arg;
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p->cc = cc;
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return 0;
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}
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int atexit2(void* func)
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{
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return atexit2(func, 0, CC_CDECL_0);
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}
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// call from main as early as possible.
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void lib_init()
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{
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/*#ifdef OS_UNIX
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udbg_init();
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#endif*/
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(void)atexit(call_exit_funcs);
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}
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// FNV1-A hash - good for strings.
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// if len = 0 (default), treat buf as a C-string;
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@ -1,4 +1,4 @@
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// Copyright (c) 2003 Jan Wassenberg
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// Copyright (c) 2003-2005 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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@ -14,8 +14,43 @@
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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#ifndef LIB_H
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#define LIB_H
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/*
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[KEEP IN SYNC WITH WIKI]
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low-level aka "lib"
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-------------------
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this codebase was grown from modules shared between several projects,
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i.e. my personal library; hence the name "lib". it has been expanded to
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fit the needs of 0ad - in particular, resource loading.
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owing to the dual-use situation, the 0ad coding conventions are not met;
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also, major changes are ill-advised because they may break other projects.
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design goals
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------------
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- fast and low-overhead, including startup time
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- portable: must run on Win32, Mac OS X and Linux
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- reusable across projects, i.e. no dependency on a
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central 'manager' that ties modules together.
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scope
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-----
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- POSIX definitions
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- resource management
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- debugging tools (including memory tracker)
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- low-level helper functions, e.g. ADTs, endian conversion and timing
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- platform-dependent system/feature detection
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*/
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#ifndef LIB_H__
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#define LIB_H__
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#include <stddef.h>
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#include <assert.h>
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@ -85,7 +120,7 @@ STMT(\
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// useful because VC may return 0 on failure, instead of throwing.
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// useful because VC6 may return 0 on failure, instead of throwing.
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// this wraps the exception handling, and creates a NULL pointer on failure.
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#define SAFE_NEW(type, ptr)\
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type* ptr;\
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@ -164,10 +199,10 @@ enum LibError
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#endif
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// For insertion into code, to avoid unused warnings:
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// 2 ways of avoiding "unreferenced formal parameter" warnings:
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// .. inside the function body, e.g. void f(int x) { UNUSED(x); }
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#define UNUSED(param) (void)param;
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// For using in parameters ("void f(int UNUSEDPARAM(x))"),
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// to avoid 'unreferenced formal parameter' warnings:
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// .. wrapped around the parameter name, e.g. void f(int UNUSEDPARAM(x))
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#define UNUSEDPARAM(param)
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@ -222,43 +257,6 @@ const size_t GiB = 1ul << 30;
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// call from main as early as possible.
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extern void lib_init(void);
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enum CallConvention // number of parameters and convention
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{
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CC_CDECL_0,
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CC_CDECL_1,
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#ifdef _WIN32
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CC_STDCALL_0,
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CC_STDCALL_1,
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#endif
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CC_UNUSED // get rid of trailing comma when !_WIN32
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};
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// more powerful atexit: registers an exit handler, with 0 or 1 parameters.
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// callable before libc initialized, and frees up the real atexit table.
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// stdcall convention is provided on Windows to call APIs (e.g. WSACleanup).
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// for these to be called at exit, lib_main must be invoked after _cinit.
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extern int atexit2(void* func, uintptr_t arg, CallConvention cc = CC_CDECL_1);
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// no parameters, cdecl (CC_CDECL_0)
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extern int atexit2(void* func);
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inline int atexit2(void (*func)())
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{
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return atexit2((void *)func);
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}
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@ -266,7 +264,7 @@ inline int atexit2(void (*func)())
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// if len = 0 (default), treat buf as a C-string;
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// otherwise, hash <len> bytes of buf.
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extern u32 fnv_hash(const void* buf, const size_t len = 0);
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extern u64 fnv_hash64(const void* buf, const size_t len);
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extern u64 fnv_hash64(const void* buf, const size_t len = 0);
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// hash (currently FNV) of a filename
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typedef u32 FnHash;
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@ -300,10 +298,4 @@ extern void base32(const int len, const u8* in, u8* out);
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extern int match_wildcard(const char* s, const char* w);
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// design goals:
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// fast (including startup time)
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// portable
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// reusable across projects (i.e. no dependency on "parent" that calls modules)
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#endif // #ifndef LIB_H
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#endif // #ifndef LIB_H__
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