1 //===-------------------- test_exception_storage.cpp ----------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // TODO(ldionne): This test fails on Ubuntu Focal on our CI nodes (and only there), in 32 bit mode.
10 // UNSUPPORTED: linux && 32bits-on-64bits
11 
12 #include <algorithm>
13 #include <cstdio>
14 #include <cstdlib>
15 #include <__threading_support>
16 #include <unistd.h>
17 
18 #include "../src/cxa_exception.h"
19 
20 typedef __cxxabiv1::__cxa_eh_globals globals_t ;
21 
22 void *thread_code (void *parm) {
23     size_t *result = (size_t *) parm;
24     globals_t *glob1, *glob2;
25 
26     glob1 = __cxxabiv1::__cxa_get_globals ();
27     if ( NULL == glob1 )
28         std::printf("Got null result from __cxa_get_globals\n");
29 
30     glob2 = __cxxabiv1::__cxa_get_globals_fast ();
31     if ( glob1 != glob2 )
32         std::printf("Got different globals!\n");
33 
34     *result = (size_t) glob1;
35 #ifndef _LIBCXXABI_HAS_NO_THREADS
36     sleep ( 1 );
37 #endif
38     return parm;
39 }
40 
41 #ifndef _LIBCXXABI_HAS_NO_THREADS
42 #define NUMTHREADS  10
43 size_t                 thread_globals [ NUMTHREADS ] = { 0 };
44 std::__libcpp_thread_t   threads        [ NUMTHREADS ];
45 #endif
46 
47 int main() {
48 #ifndef _LIBCXXABI_HAS_NO_THREADS
49 //  Make the threads, let them run, and wait for them to finish
50     for ( int i = 0; i < NUMTHREADS; ++i )
51         std::__libcpp_thread_create ( threads + i, thread_code, (void *) (thread_globals + i));
52     for ( int i = 0; i < NUMTHREADS; ++i )
53         std::__libcpp_thread_join ( &threads [ i ] );
54 
55     int retVal = 0;
56     for ( int i = 0; i < NUMTHREADS; ++i ) {
57         if ( 0 == thread_globals [ i ] ) {
58             std::printf("Thread #%d had a zero global\n", i);
59             retVal = 1;
60         }
61     }
62 
63     std::sort ( thread_globals, thread_globals + NUMTHREADS );
64     for ( int i = 1; i < NUMTHREADS; ++i ) {
65         if ( thread_globals [ i - 1 ] == thread_globals [ i ] ) {
66             std::printf("Duplicate thread globals (%d and %d)\n", i-1, i);
67             retVal = 2;
68         }
69     }
70     return retVal;
71 #else // _LIBCXXABI_HAS_NO_THREADS
72     size_t thread_globals;
73     thread_code(&thread_globals);
74     // Check that __cxa_get_globals() is not NULL.
75     return (thread_globals == 0) ? 1 : 0;
76 #endif // !_LIBCXXABI_HAS_NO_THREADS
77 }
78