[src/trunk]: src/lib/libpthread Fix previous: Can't use calloc/malloc before ...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/1dc5178e4306
branches:  trunk
changeset: 808680:1dc5178e4306
user:      christos <christos%NetBSD.org@localhost>
date:      Fri May 29 16:05:13 2015 +0000

description:
Fix previous: Can't use calloc/malloc before we complete initialization
of the thread library, because malloc uses pthread_foo_specific, and it will
end up initializing itself incorrectly.

diffstat:

 lib/libpthread/pthread.c     |  15 ++++---------
 lib/libpthread/pthread_int.h |   4 +-
 lib/libpthread/pthread_tsd.c |  47 +++++++++++++++++++++++++------------------
 3 files changed, 34 insertions(+), 32 deletions(-)

diffs (137 lines):

diff -r 18f19cc7777c -r 1dc5178e4306 lib/libpthread/pthread.c
--- a/lib/libpthread/pthread.c  Fri May 29 14:15:14 2015 +0000
+++ b/lib/libpthread/pthread.c  Fri May 29 16:05:13 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pthread.c,v 1.146 2015/05/29 07:37:31 manu Exp $       */
+/*     $NetBSD: pthread.c,v 1.147 2015/05/29 16:05:13 christos Exp $   */
 
 /*-
  * Copyright (c) 2001, 2002, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: pthread.c,v 1.146 2015/05/29 07:37:31 manu Exp $");
+__RCSID("$NetBSD: pthread.c,v 1.147 2015/05/29 16:05:13 christos Exp $");
 
 #define        __EXPOSE_STACK  1
 
@@ -173,14 +173,9 @@
         * while pthread_keys descriptors are not 
         * yet allocated.
         */
-       if (pthread_tsd_init() != 0)
-               err(EXIT_FAILURE, "Cannot allocate pthread_keys descriptors");
-
-       __pthread_st_size = sizeof(*pthread__main)
-                + pthread_keys_max * sizeof(pthread__main->pt_specific[0]);
-
-       if ((pthread__main = calloc(1, __pthread_st_size)) == NULL)
-               err(EXIT_FAILURE, "Cannot allocate pthread__specific");
+       pthread__main = pthread_tsd_init(&__pthread_st_size);
+       if (pthread__main == NULL)
+               err(EXIT_FAILURE, "Cannot allocate pthread storage");
 
        __uselibcstub = 0;
 
diff -r 18f19cc7777c -r 1dc5178e4306 lib/libpthread/pthread_int.h
--- a/lib/libpthread/pthread_int.h      Fri May 29 14:15:14 2015 +0000
+++ b/lib/libpthread/pthread_int.h      Fri May 29 16:05:13 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pthread_int.h,v 1.91 2015/05/29 07:37:31 manu Exp $    */
+/*     $NetBSD: pthread_int.h,v 1.92 2015/05/29 16:05:13 christos Exp $        */
 
 /*-
  * Copyright (c) 2001, 2002, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -292,7 +292,7 @@
        }                                                               \
         } while (/*CONSTCOND*/0)
 
-int    pthread_tsd_init(void) PTHREAD_HIDE;
+void   *pthread_tsd_init(size_t *) PTHREAD_HIDE;
 void   pthread__destroy_tsd(pthread_t) PTHREAD_HIDE;
 __dead void    pthread__assertfunc(const char *, int, const char *, const char *)
                            PTHREAD_HIDE;
diff -r 18f19cc7777c -r 1dc5178e4306 lib/libpthread/pthread_tsd.c
--- a/lib/libpthread/pthread_tsd.c      Fri May 29 14:15:14 2015 +0000
+++ b/lib/libpthread/pthread_tsd.c      Fri May 29 16:05:13 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pthread_tsd.c,v 1.12 2015/05/29 07:37:31 manu Exp $    */
+/*     $NetBSD: pthread_tsd.c,v 1.13 2015/05/29 16:05:13 christos Exp $        */
 
 /*-
  * Copyright (c) 2001, 2007 The NetBSD Foundation, Inc.
@@ -30,10 +30,11 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: pthread_tsd.c,v 1.12 2015/05/29 07:37:31 manu Exp $");
+__RCSID("$NetBSD: pthread_tsd.c,v 1.13 2015/05/29 16:05:13 christos Exp $");
 
 /* Functions and structures dealing with thread-specific data */
 #include <errno.h>
+#include <sys/mman.h>
 
 #include "pthread.h"
 #include "pthread_int.h"
@@ -59,13 +60,14 @@
 #include <stdlib.h>
 #include <stdio.h>
 
-int
-pthread_tsd_init(void)
+void *
+pthread_tsd_init(size_t *tlen)
 {
        char *pkm;
-       size_t len;
+       size_t alen;
+       char *arena;
 
-       if ((pkm = getenv("PTHREAD_KEYS_MAX")) != NULL) {
+       if ((pkm = pthread__getenv("PTHREAD_KEYS_MAX")) != NULL) {
                pthread_keys_max = (int)strtol(pkm, NULL, 0);
                if (pthread_keys_max < _POSIX_THREAD_KEYS_MAX)
                        pthread_keys_max = _POSIX_THREAD_KEYS_MAX;
@@ -73,22 +75,27 @@
                pthread_keys_max = PTHREAD_KEYS_MAX;
        }
 
-       len = sizeof(*pthread__tsd_list);
-       if ((pthread__tsd_list = calloc(pthread_keys_max, len)) == NULL)
-               goto out1;
-
-       len = sizeof(*pthread__tsd_destructors);
-       if ((pthread__tsd_destructors = calloc(pthread_keys_max, len)) == NULL) 
-               goto out2;
+       /*
+        * Can't use malloc here yet, because malloc will use the fake
+        * libc thread functions to initialize itself, so mmap the space.
+        */
+       *tlen = sizeof(struct __pthread_st)
+           + pthread_keys_max * sizeof(struct pt_specific);
+       alen = *tlen
+           + sizeof(*pthread__tsd_list) * pthread_keys_max
+           + sizeof(*pthread__tsd_destructors) * pthread_keys_max;
 
-       return 0;
+       arena = mmap(NULL, alen, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0);
+       if (arena == MAP_FAILED) {
+               pthread_keys_max = 0;
+               return NULL;
+       }
 
-out2:
-       free(pthread__tsd_list);
-out1:
-       pthread_keys_max = 0;
-
-       return -1;
+       pthread__tsd_list = (void *)arena;
+       arena += sizeof(*pthread__tsd_list) * pthread_keys_max;
+       pthread__tsd_destructors = (void *)arena;
+       arena += sizeof(*pthread__tsd_destructors) * pthread_keys_max;
+       return arena;
 }
 
 int