Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 325 insertions, 0 deletions

diff --git a/third_party/heimdal/lib/base/dll.c b/third_party/heimdal/lib/base/dll.c
new file mode 100644
index 0000000..53f1f63
--- /dev/null
+++ b/third_party/heimdal/lib/base/dll.c
@@ -0,0 +1,325 @@
+/***********************************************************************
+ * Copyright (c) 2016 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ **********************************************************************/
+
+/*
+ * This is an implementation of thread-specific storage with
+ * destructors.  WIN32 doesn't quite have this.  Instead it has
+ * DllMain(), an entry point in every DLL that gets called to notify the
+ * DLL of thread/process "attach"/"detach" events.
+ *
+ * We use __thread (or __declspec(thread)) for the thread-local itself
+ * and DllMain() DLL_THREAD_DETACH events to drive destruction of
+ * thread-local values.
+ *
+ * When building in maintainer mode on non-Windows pthread systems this
+ * uses a single pthread key instead to implement multiple keys.  This
+ * keeps the code from rotting when modified by non-Windows developers.
+ */
+
+#include "baselocl.h"
+
+#ifdef WIN32
+#include <windows.h>
+#endif
+
+#ifdef HEIM_WIN32_TLS
+#include <assert.h>
+#include <err.h>
+#include <heim_threads.h>
+
+#ifndef WIN32
+#include <pthread.h>
+#endif
+
+/* Logical array of keys that grows lock-lessly */
+typedef struct tls_keys tls_keys;
+struct tls_keys {
+    void (**keys_dtors)(void *);    /* array of destructors         */
+    size_t keys_start_idx;          /* index of first destructor    */
+    size_t keys_num;
+    tls_keys *keys_next;
+};
+
+/*
+ * Well, not quite locklessly.  We need synchronization primitives to do
+ * this locklessly.  An atomic CAS will do.
+ */
+static HEIMDAL_MUTEX tls_key_defs_lock = HEIMDAL_MUTEX_INITIALIZER;
+static tls_keys *tls_key_defs;
+
+/* Logical array of values (per-thread; no locking needed here) */
+struct tls_values {
+    void **values; /* realloc()ed */
+    size_t values_num;
+};
+
+static HEIMDAL_THREAD_LOCAL struct tls_values values;
+
+static char dead_key[1];
+static void no_dtor(void *d) { (void)d; }
+
+void
+heim_w32_service_thread_detach(void *unused)
+{
+    tls_keys *key_defs;
+    void (*dtor)(void*);
+    size_t i;
+
+    HEIMDAL_MUTEX_lock(&tls_key_defs_lock);
+    key_defs = tls_key_defs;
+    HEIMDAL_MUTEX_unlock(&tls_key_defs_lock);
+
+    if (key_defs == NULL)
+        return;
+
+    for (i = 0; i < values.values_num; i++) {
+        assert(i >= key_defs->keys_start_idx);
+        if (i >= key_defs->keys_start_idx + key_defs->keys_num) {
+            HEIMDAL_MUTEX_lock(&tls_key_defs_lock);
+            key_defs = key_defs->keys_next;
+            HEIMDAL_MUTEX_unlock(&tls_key_defs_lock);
+
+            assert(key_defs != NULL);
+            assert(i >= key_defs->keys_start_idx);
+            assert(i < key_defs->keys_start_idx + key_defs->keys_num);
+        }
+        dtor = key_defs->keys_dtors[i - key_defs->keys_start_idx];
+        if (values.values[i] != NULL && dtor != NULL && dtor != no_dtor)
+            dtor(values.values[i]);
+        values.values[i] = NULL;
+    }
+}
+
+#if !defined(WIN32)
+static pthread_key_t pt_key;
+pthread_once_t pt_once = PTHREAD_ONCE_INIT;
+
+static void
+atexit_del_tls_for_thread(void)
+{
+    heim_w32_service_thread_detach(NULL);
+}
+
+static void
+create_pt_key(void)
+{
+    int ret;
+
+    /* The main thread may not execute TLS destructors */
+    atexit(atexit_del_tls_for_thread);
+    ret = pthread_key_create(&pt_key, heim_w32_service_thread_detach);
+    if (ret != 0)
+        err(1, "pthread_key_create() failed");
+}
+
+#endif
+
+int
+heim_w32_key_create(HEIM_PRIV_thread_key *key, void (*dtor)(void *))
+{
+    tls_keys *key_defs, *new_key_defs;
+    size_t i, k;
+    int ret = ENOMEM;
+
+#if !defined(WIN32)
+    (void) pthread_once(&pt_once, create_pt_key);
+    (void) pthread_setspecific(pt_key, dead_key);
+#endif
+
+    HEIMDAL_MUTEX_lock(&tls_key_defs_lock);
+    if (tls_key_defs == NULL) {
+        /* First key */
+        new_key_defs = calloc(1, sizeof(*new_key_defs));
+        if (new_key_defs == NULL) {
+            HEIMDAL_MUTEX_unlock(&tls_key_defs_lock);
+            return ENOMEM;
+        }
+        new_key_defs->keys_num = 8;
+        new_key_defs->keys_dtors = calloc(new_key_defs->keys_num,
+                                          sizeof(*new_key_defs->keys_dtors));
+        if (new_key_defs->keys_dtors == NULL) {
+            HEIMDAL_MUTEX_unlock(&tls_key_defs_lock);
+            free(new_key_defs);
+            return ENOMEM;
+        }
+        tls_key_defs = new_key_defs;
+        new_key_defs->keys_dtors[0] = dtor;
+        for (i = 1; i < new_key_defs->keys_num; i++)
+            new_key_defs->keys_dtors[i] = NULL;
+        HEIMDAL_MUTEX_unlock(&tls_key_defs_lock);
+        return 0;
+    }
+
+    for (key_defs = tls_key_defs;
+         key_defs != NULL;
+         key_defs = key_defs->keys_next) {
+        k = key_defs->keys_start_idx;
+        for (i = 0; i < key_defs->keys_num; i++, k++) {
+            if (key_defs->keys_dtors[i] == NULL) {
+                /* Found free slot; use it */
+                key_defs->keys_dtors[i] = dtor;
+                *key = k;
+                HEIMDAL_MUTEX_unlock(&tls_key_defs_lock);
+                return 0;
+            }
+        }
+        if (key_defs->keys_next != NULL)
+            continue;
+
+        /* Grow the registration array */
+        /* XXX DRY */
+        new_key_defs = calloc(1, sizeof(*new_key_defs));
+        if (new_key_defs == NULL)
+            break;
+
+        new_key_defs->keys_dtors =
+            calloc(key_defs->keys_num + key_defs->keys_num / 2,
+                   sizeof(*new_key_defs->keys_dtors));
+        if (new_key_defs->keys_dtors == NULL) {
+            free(new_key_defs);
+            break;
+        }
+        new_key_defs->keys_start_idx = key_defs->keys_start_idx +
+            key_defs->keys_num;
+        new_key_defs->keys_num = key_defs->keys_num + key_defs->keys_num / 2;
+        new_key_defs->keys_dtors[i] = dtor;
+        for (i = 1; i < new_key_defs->keys_num; i++)
+            new_key_defs->keys_dtors[i] = NULL;
+        key_defs->keys_next = new_key_defs;
+        ret = 0;
+        break;
+    }
+    HEIMDAL_MUTEX_unlock(&tls_key_defs_lock);
+    return ret;
+}
+
+static void
+key_lookup(HEIM_PRIV_thread_key key, tls_keys **kd,
+           size_t *dtor_idx, void (**dtor)(void *))
+{
+    tls_keys *key_defs;
+
+    if (kd != NULL)
+        *kd = NULL;
+    if (dtor_idx != NULL)
+        *dtor_idx = 0;
+    if (dtor != NULL)
+        *dtor = NULL;
+
+    HEIMDAL_MUTEX_lock(&tls_key_defs_lock);
+    key_defs = tls_key_defs;
+    HEIMDAL_MUTEX_unlock(&tls_key_defs_lock);
+
+    while (key_defs != NULL) {
+        if (key >= key_defs->keys_start_idx &&
+            key < key_defs->keys_start_idx + key_defs->keys_num) {
+            if (kd != NULL)
+                *kd = key_defs;
+            if (dtor_idx != NULL)
+                *dtor_idx = key - key_defs->keys_start_idx;
+            if (dtor != NULL)
+                *dtor = key_defs->keys_dtors[key - key_defs->keys_start_idx];
+            return;
+        }
+
+        HEIMDAL_MUTEX_lock(&tls_key_defs_lock);
+        key_defs = key_defs->keys_next;
+        HEIMDAL_MUTEX_unlock(&tls_key_defs_lock);
+        assert(key_defs != NULL);
+        assert(key >= key_defs->keys_start_idx);
+    }
+}
+
+int
+heim_w32_delete_key(HEIM_PRIV_thread_key key)
+{
+    tls_keys *key_defs;
+    size_t dtor_idx;
+
+    key_lookup(key, &key_defs, &dtor_idx, NULL);
+    if (key_defs == NULL)
+        return EINVAL;
+    key_defs->keys_dtors[dtor_idx] = no_dtor;
+    return 0;
+}
+
+int
+heim_w32_setspecific(HEIM_PRIV_thread_key key, void *value)
+{
+    void **new_values;
+    size_t new_num;
+    void (*dtor)(void *);
+    size_t i;
+
+#if !defined(WIN32)
+    (void) pthread_setspecific(pt_key, dead_key);
+#endif
+
+    key_lookup(key, NULL, NULL, &dtor);
+    if (dtor == NULL)
+        return EINVAL;
+
+    if (key >= values.values_num) {
+        if (values.values_num == 0) {
+            values.values = NULL;
+            new_num = 8;
+        } else {
+            new_num = (values.values_num + values.values_num / 2);
+        }
+        new_values = realloc(values.values, sizeof(void *) * new_num);
+        if (new_values == NULL)
+            return ENOMEM;
+        for (i = values.values_num; i < new_num; i++)
+            new_values[i] = NULL;
+        values.values = new_values;
+        values.values_num = new_num;
+    }
+
+    assert(key < values.values_num);
+
+    if (values.values[key] != NULL && dtor != NULL && dtor != no_dtor)
+        dtor(values.values[key]);
+
+    values.values[key] = value;
+    return 0;
+}
+
+void *
+heim_w32_getspecific(HEIM_PRIV_thread_key key)
+{
+    if (key >= values.values_num)
+        return NULL;
+    return values.values[key];
+}
+
+#else
+static char dummy;
+#endif /* HEIM_WIN32_TLS */