libcdecl: Punt gnulib tls module.

[cdecl99.git] / src / error.c

diff --git a/src/error.c b/src/error.c
index 94987af6a90f3a7eb83ce661a4d87b3c75efb7a8..0ff31ee0a4f6871e5eaadac892aed76c4b2b7878 100644 (file)
--- a/src/error.c
+++ b/src/error.c
@@ -20,15 +20,30 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <assert.h>
+#include <stdbool.h>
 
 #include "cdecl.h"
 #include "cdecl-internal.h"
 
 #include <glthread/lock.h>
-#include <glthread/tls.h>
 
 #include "errmsg.h"
 
+#if USE_POSIX_THREADS
+#  include "thread-posix.h"
+#elif USE_ISOC_THREADS || USE_ISOC_AND_POSIX_THREADS
+#  include "thread-stdc.h"
+#elif USE_WINDOWS_THREADS
+#  include "thread-w32.h"
+#else
+static void *tls_key;
+enum { tls_key_valid = 1 };
+
+#define tls_key_init() ((void)0)
+#define tls_get() tls_key
+#define tls_set(a) (tls_key = (a), 1)
+#endif
+
 struct err_state {
        struct cdecl_error err;
        size_t nstr;
@@ -37,15 +52,6 @@ struct err_state {
 
 /* This pre-initialized error is reserved for dire out-of-memory conditions. */
 static struct cdecl_error err_no_mem;
-static gl_tls_key_t tls_key;
-
-static void free_err(void *err)
-{
-       if (err == &err_no_mem)
-               return;
-
-       free(err);
-}
 
 static void set_err(unsigned code, struct cdecl_error *err)
 {
@@ -70,7 +76,7 @@ static void initialize_cb(void)
        bindtextdomain("bison-runtime", BISON_LOCALEDIR);
 #endif
        set_err(CDECL__ENOMEM, &err_no_mem);
-       gl_tls_key_init(tls_key, free_err);
+       tls_key_init();
 }
 
 static void *alloc_err_state(void *old, size_t buf_size)
@@ -81,16 +87,22 @@ static void *alloc_err_state(void *old, size_t buf_size)
        state = p = realloc(old, offsetof(struct err_state, str) + buf_size);
        if (state) {
                state->nstr = buf_size;
+               if (!tls_set(state)) {
+                       /*
+                        * We have to presume that pthread_setspecific etc.
+                        * cannot fail after the key has been successfully
+                        * assigned once, because there seems to be no
+                        * reasonable recovery from such a scenario.
+                        */
+                       free(p);
+                       p = NULL;
+               }
        } else if (old) {
                /* Failed allocation, but existing state is still good */
                p = old;
-       } else {
-               /* Failed allocation, no existing state */
-               p = &err_no_mem;
        }
 
-       gl_tls_set(tls_key, p);
-       return state;
+       return p;
 }
 
 static struct err_state *get_err_state(void)
@@ -98,12 +110,10 @@ static struct err_state *get_err_state(void)
        void *state;
 
        gl_once_define(static, tls_initialized)
-       gl_once(tls_initialized, initialize_cb);
+       if (glthread_once(&tls_initialized, initialize_cb) || !tls_key_valid)
+               return NULL;
 
-       state = gl_tls_get(tls_key);
-       if (state == &err_no_mem)
-               state = NULL;
-       if (!state)
+       if (!(state = tls_get()))
                return alloc_err_state(state, 100);
        return state;
 }
@@ -197,5 +207,5 @@ const struct cdecl_error *cdecl_get_error(void)
 {
        struct err_state *state = get_err_state();
 
-       return state ? &state->err : NULL;
+       return state ? &state->err : &err_no_mem;
 }