__cxxabiv1 Namespace Reference

Data Structures
struct	cxaguard

Typedefs
typedef typedef__extension__ struct cxaguard	__guard

Functions
int	__cxa_guard_acquire (__guard *g)
void	__cxa_guard_release (__guard *g)
void	__cxa_guard_abort (__guard *g)

Variables
Mutex	cxaGuard ("cxaguard")

Detailed Description

Special thanks to the LLVM maintainers and Apple for their fantastic comments explaining what these functions are supposed to do, as well as providing implementation inspiration. See the link at the top of this source file for details.

Typedef Documentation

__guard

typedef typedef__extension__ struct cxaguard __cxxabiv1::__guard

Definition at line 73 of file gcc.cpp.

Function Documentation

__cxa_guard_abort()

void __cxxabiv1::__cxa_guard_abort

(

__guard *

g

)

Definition at line 135 of file gcc.cpp.

{
    cxaGuard.unlock();
    cxaGuardSetNotInUse(g);
}

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__cxa_guard_acquire()

int __cxxabiv1::__cxa_guard_acquire

(

__guard *

g

)

Definition at line 108 of file gcc.cpp.

{
    if (cxaGuardHasInitializerRun(g)) {
        return 0;
    }
 
    cxaGuard.lock();
    // Ensure another thread didn't beat us to the chase
    if (cxaGuardHasInitializerRun(g)) {
        cxaGuard.unlock();
        return 0;
    }
 
    if (cxaGuardIsInUse(g)) {
        panicf("[%s] __guard in bad state", __func__);
    }
 
    cxaGuardSetInUse(g);
    return 1;
}

__cxa_guard_release()

void __cxxabiv1::__cxa_guard_release

(

__guard *

g

)

Definition at line 129 of file gcc.cpp.

{
    cxaGuardSetInitializeHasRun(g);
    cxaGuard.unlock();
}

Variable Documentation

cxaGuard

Mutex __cxxabiv1::cxaGuard("cxaguard")

All static object initializations are protected by the single, global, recursive mutex. The recursive mutex is apparently required to enable nested objects initialization

FIXME: This needs to be a recursive lock when those are added