1 // Copyright 2010 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
8 #include <sys/resource.h>
11 #include "go-assert.h"
13 /* For targets which don't have the required sync support. Really
14 these should be provided by gcc itself. FIXME. */
16 #if !defined (HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4) || !defined (HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8) || !defined (HAVE_SYNC_FETCH_AND_ADD_4) || !defined (HAVE_SYNC_ADD_AND_FETCH_8)
18 static pthread_mutex_t sync_lock = PTHREAD_MUTEX_INITIALIZER;
22 #ifndef HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4
25 __sync_bool_compare_and_swap_4 (uint32*, uint32, uint32)
26 __attribute__ ((visibility ("hidden")));
29 __sync_bool_compare_and_swap_4 (uint32* ptr, uint32 old, uint32 new)
34 i = pthread_mutex_lock (&sync_lock);
45 i = pthread_mutex_unlock (&sync_lock);
53 #ifndef HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8
56 __sync_bool_compare_and_swap_8 (uint64*, uint64, uint64)
57 __attribute__ ((visibility ("hidden")));
60 __sync_bool_compare_and_swap_8 (uint64* ptr, uint64 old, uint64 new)
65 i = pthread_mutex_lock (&sync_lock);
76 i = pthread_mutex_unlock (&sync_lock);
84 #ifndef HAVE_SYNC_FETCH_AND_ADD_4
87 __sync_fetch_and_add_4 (uint32*, uint32)
88 __attribute__ ((visibility ("hidden")));
91 __sync_fetch_and_add_4 (uint32* ptr, uint32 add)
96 i = pthread_mutex_lock (&sync_lock);
102 i = pthread_mutex_unlock (&sync_lock);
103 __go_assert (i == 0);
110 #ifndef HAVE_SYNC_ADD_AND_FETCH_8
113 __sync_add_and_fetch_8 (uint64*, uint64)
114 __attribute__ ((visibility ("hidden")));
117 __sync_add_and_fetch_8 (uint64* ptr, uint64 add)
122 i = pthread_mutex_lock (&sync_lock);
123 __go_assert (i == 0);
128 i = pthread_mutex_unlock (&sync_lock);
129 __go_assert (i == 0);
137 runtime_memlimit(void)
142 if(getrlimit(RLIMIT_AS, &rl) != 0)
144 if(rl.rlim_cur >= 0x7fffffff)
147 // Estimate our VM footprint excluding the heap.
148 // Not an exact science: use size of binary plus
149 // some room for thread stacks.
151 if(used >= rl.rlim_cur)
154 // If there's not at least 16 MB left, we're probably
155 // not going to be able to do much. Treat as no limit.
157 if(rl.rlim_cur < (16<<20))
160 return rl.rlim_cur - used;