57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/**
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* =========================================================================
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* File : module_init.h
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* Project : 0 A.D.
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* Description : helpers for module initialization/shutdown.
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#ifndef INCLUDED_MODULE_INIT
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#define INCLUDED_MODULE_INIT
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/**
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* initialization state of a module: class, source file, or whatever.
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*
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* can be declared as a static variable => no initializer needed,
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* since 0 is the correct initial value.
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*
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* DO NOT change the value directly! (that'd break the carefully thought-out
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* lock-free implementation)
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**/
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typedef uintptr_t ModuleInitState; // uintptr_t required by cpu_CAS
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/**
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* @return whether initialization should go forward, i.e. initState is
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* currently MODULE_UNINITIALIZED. increments initState afterwards.
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*
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* (the reason for this function - and tricky part - is thread-safety)
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**/
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extern bool ModuleShouldInitialize(volatile ModuleInitState* initState);
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/**
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* if module reference count is valid, decrement it.
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* @return whether shutdown should go forward, i.e. this is the last
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* shutdown call.
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**/
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extern bool ModuleShouldShutdown(volatile ModuleInitState* initState);
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/**
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* indicate the module is unusable, e.g. due to failure during init.
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* all subsequent ModuleShouldInitialize/ModuleShouldShutdown calls
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* for this initState will return false.
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**/
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extern void ModuleSetError(volatile ModuleInitState* initState);
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/**
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* @return whether the module is in the failure state, i.e. ModuleSetError
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* was previously called on the same initState.
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*
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* this function is provided so that modules can report init failure to
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* the second or later caller.
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**/
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extern bool ModuleIsError(volatile ModuleInitState* initState);
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#endif // #ifndef INCLUDED_MODULE_INIT
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