thodg/libgit2/src/git/errors.h

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• Hash : a1d34bc0
  Author :
  Date : 2008-12-30T21:49:38
  

  Support building on Mac OS X by using pthread_getspecific for TLS The Mach-O format does not permit gcc to implement the __thread TLS specification, so we must instead emulate it using a single int cell allocated from memory and stored inside of the thread specific data associated with the current pthread. What makes this tricky is git_errno must be a valid lvalue, so we really need to return a pointer to the caller and deference it as part of the git_errno macro. The GCC-specific __attribute__((constructor)) extension is used to ensure the pthread_key_t is allocated before any Git functions are executed in the library, as this is necessary to access our thread specific storage. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

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• src/git/errors.h

• #ifndef INCLUDE_git_errors_h__
  #define INCLUDE_git_errors_h__
  
  #include "common.h"
  #include "thread-utils.h"
  
  /**
   * @file git/errors.h
   * @brief Git error handling routines and variables
   * @ingroup Git
   * @{
   */
  GIT_BEGIN_DECL
  
  /** The git errno. */
  #if defined(GIT_TLS)
  GIT_EXTERN(int) GIT_TLS git_errno;
  
  #elif defined(GIT_HAS_PTHREAD)
  # define git_errno (*git__errno_storage())
  GIT_EXTERN(int *) git__errno_storage(void);
  
  #endif
  
  /**
   * strerror() for the Git library
   * @param num The error code to explain
   * @return a string explaining the error code
   */
  GIT_EXTERN(const char *) git_strerror(int num);
  
  /** @} */
  GIT_END_DECL
  #endif
  

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