kc3-lang/brotli/c/enc/static_init_lazy.cc

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• Hash : 6a4c96b1
  Author :
  Date : 2025-08-07T01:30:51
  

  more portable emergency exit
  
  PiperOrigin-RevId: 792046166
  

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• c/enc/static_init_lazy.cc

• #include "third_party/brotli/common/platform.h"
  #include "static_init.h"
  
  #if (BROTLI_STATIC_INIT != BROTLI_STATIC_INIT_LAZY)
  #error "BROTLI_STATIC_INIT should be BROTLI_STATIC_INIT_LAZY"
  #endif
  
  void BrotliEncoderLazyStaticInit(void) {
    /* From https://en.cppreference.com/w/cpp/language/storage_duration.html:
       ### Static block variables ###
       Block variables with static or thread (since C++11) storage duration are
       initialized the first time control passes through their declaration...
       On all further calls, the declaration is skipped...
       If multiple threads attempt to initialize the same static local variable
       concurrently, the initialization occurs exactly once...
       Usual implementations of this feature use variants of the double-checked
       locking pattern, which reduces runtime overhead for already-initialized
       local statics to a single non-atomic boolean comparison.
     */
    static bool ok = [](){
      BrotliEncoderLazyStaticInitInner();
      return true;
    }();
    if (!ok) BROTLI_CRASH();
  }
  

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