TclTLS
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Comment:Ensure initialization happens only once even with unthreaded Tcl
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SHA1: 10e3f2e20c0067cd73e6f31c2c4276ee2880ab14
User & Date: rkeene on 2016-12-02 16:41:00
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Context
2016-12-02
18:52
Updated to include a copy of the autoconf macros we use in our version control, autogen will update them check-in: f755cb09a6 user: rkeene tags: tls-1-7
16:41
Ensure initialization happens only once even with unthreaded Tcl check-in: 10e3f2e20c user: rkeene tags: tls-1-7
16:28
For unsupported options do even less check-in: 3842146243 user: rkeene tags: tls-1-7
Changes
Side-by-Side Diff Ignore Whitespace Patch
Modified tls.c from [63f1a729cf] to [31dba4da9e].
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 *------------------------------------------------------*
 */
static int TlsLibInit (void) {
    static int initialized = 0;
    int i;
    char rnd_seed[16] = "GrzSlplKqUdnnzP!";	/* 16 bytes */
    int status=TCL_OK;
#if defined(OPENSSL_THREADS) && defined(TCL_THREADS)
    size_t num_locks;

    if (initialized) {
        return status;
    }
	Tcl_MutexLock(&init_mx);
	if (!initialized) {
	    initialized = 1;
#else
       {
    initialized = 1;

#if defined(OPENSSL_THREADS) && defined(TCL_THREADS)
    size_t num_locks;

    Tcl_MutexLock(&init_mx);
#endif

	    if (CRYPTO_set_mem_functions((void *(*)(size_t))Tcl_Alloc,
					 (void *(*)(void *, size_t))Tcl_Realloc,
					 (void(*)(void *))Tcl_Free) == 0) {
	       /* Not using Tcl's mem functions ... not critical */
	    }
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	    srand((unsigned int) time((time_t *) NULL));
	    do {
		for (i = 0; i < 16; i++) {
		    rnd_seed[i] = 1 + (char) (255.0 * rand()/(RAND_MAX+1.0));
		}
		RAND_seed(rnd_seed, sizeof(rnd_seed));
	    } while (RAND_status() != 1);
	}

done:

#if defined(OPENSSL_THREADS) && defined(TCL_THREADS)
	Tcl_MutexUnlock(&init_mx);
#endif
    return status;
}
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