contrib/libs/jemalloc/reg_zone.cpp


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#include <util/system/compiler.h> 
 
extern "C" void je_zone_register();

static volatile bool initialized = false; 
 
namespace {
    struct TInit { 
        inline TInit() {
            if (!initialized) { 
                je_zone_register();
                initialized = true; 
            } 
        }
    }; 
 
    void zone_register() {
        static TInit init; 
    } 
}
 
extern "C" { 
    void je_assure_zone_register() {
        if (Y_LIKELY(initialized)) { 
            return; 
        } 
 
        // Even if we have read false "initialized", real init will be syncronized once by 
        // Meyers singleton in <anonymous>::register_zone(). We could do a few 
        // redundant "initialized" and singleton creation checks, but no more than that. 
        zone_register();
    } 
}