RE: proposal for ICU tracing

Ed,

> As long as the tracing functionality degrades
> gracefuly on non-threading platforms, I think using
> TLS for tracing is a good idea.

#include "unicode/utypes.h"
/* APP_NO_THREADS is an old symbol. We'll honor it if present. */
#ifdef APP_NO_THREADS
# define ICU_USE_THREADS 0
#endif

/* Default: use threads. */
#ifndef ICU_USE_THREADS
# define ICU_USE_THREADS 1
#endif
#if defined(POSIX) && (ICU_USE_THREADS==1)
# include <pthread.h> /* must be first, so that we get the multithread
versions of things. */
#endif

Then:

#if defined(WIN32) && (ICU_USE_THREADS==1)
typedef struct xTLSKey
{
   DWORD key;
} xTLSKey;
#define xiua_get_tls_pointer(x)  TlsGetValue(x.key)

#elif defined(POSIX) && (ICU_USE_THREADS==1)
typedef struct xTLSKey
{
   pthread_key_t key;
} xTLSKey;
   ret = ;
GetRxLocalValue
#define xiua_get_tls_pointer(x)  pthread_getspecific(x.key)
#else
typedef struct xTLSKey
{
   void * key;
} xTLSKey;
#define xiua_get_tls_pointer(x)  (x.key)
#endif
static xTLSKey xiua_tls_key;

Later:

#if defined(WIN32) && (ICU_USE_THREADS==1)

#elif defined(POSIX) && (ICU_USE_THREADS==1)

#else

#endif

Carl