thodg/libgit2/src/errors.c

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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/errors.c

• #include "common.h"
  #include "thread-utils.h" /* for GIT_TLS */
  
  #if defined(GIT_TLS)
  /* compile-time constant initialization required */
  GIT_TLS int git_errno = 0;
  
  #elif defined(GIT_HAS_PTHREAD)
  
  static pthread_key_t errno_key;
  
  static void init_errno(void) __attribute__((constructor));
  static void init_errno(void)
  {
  	pthread_key_create(&errno_key, free);
  }
  
  int *git__errno_storage(void)
  {
  	int *e = pthread_getspecific(errno_key);
  	if (!e) {
  		e = calloc(1, sizeof(*e));
  		pthread_setspecific(errno_key, e);
  	}
  	return e;
  }
  
  #endif
  
  static struct {
  	int num;
  	const char *str;
  } error_codes[] = {
  	{ GIT_ENOTOID, "Not a git oid" },
  	{ GIT_ENOTFOUND, "Object does not exist in the scope searched" },
  };
  
  const char *git_strerror(int num)
  {
  	int i;
  	for (i = 0; i < ARRAY_SIZE(error_codes); i++)
  		if (num == error_codes[i].num)
  			return error_codes[i].str;
  
  	return "Unknown error";
  }
  

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