#include "lto-section-names.h"
#include "collect-utils.h"
-#include <thread>
-
/* Environment variable, used for passing the names of offload targets from GCC
driver to lto-wrapper. */
#define OFFLOAD_TARGET_NAMES_ENV "OFFLOAD_TARGET_NAMES"
return *((const int *)b)-*((const int *)a);
}
+/* Number of CPUs that can be used for parallel LTRANS phase. */
+
+static unsigned long nthreads_var = 0;
+
+#ifdef HAVE_PTHREAD_AFFINITY_NP
+unsigned long cpuset_size;
+static unsigned long get_cpuset_size;
+cpu_set_t *cpusetp;
+
+unsigned long
+static cpuset_popcount (unsigned long cpusetsize, cpu_set_t *cpusetp)
+{
+#ifdef CPU_COUNT_S
+ /* glibc 2.7 and above provide a macro for this. */
+ return CPU_COUNT_S (cpusetsize, cpusetp);
+#else
+#ifdef CPU_COUNT
+ if (cpusetsize == sizeof (cpu_set_t))
+ /* glibc 2.6 and above provide a macro for this. */
+ return CPU_COUNT (cpusetp);
+#endif
+ size_t i;
+ unsigned long ret = 0;
+ STATIC_ASSERT (sizeof (cpusetp->__bits[0]) == sizeof (unsigned long int));
+ for (i = 0; i < cpusetsize / sizeof (cpusetp->__bits[0]); i++)
+ {
+ unsigned long int mask = cpusetp->__bits[i];
+ if (mask == 0)
+ continue;
+ ret += __builtin_popcountl (mask);
+ }
+ return ret;
+#endif
+}
+#endif
+
+/* At startup, determine the default number of threads. It would seem
+ this should be related to the number of cpus online. */
+
+static void
+init_num_threads (void)
+{
+#ifdef HAVE_PTHREAD_AFFINITY_NP
+#if defined (_SC_NPROCESSORS_CONF) && defined (CPU_ALLOC_SIZE)
+ cpuset_size = sysconf (_SC_NPROCESSORS_CONF);
+ cpuset_size = CPU_ALLOC_SIZE (cpuset_size);
+#else
+ cpuset_size = sizeof (cpu_set_t);
+#endif
+
+ cpusetp = (cpu_set_t *) xmalloc (gomp_cpuset_size);
+ do
+ {
+ int ret = pthread_getaffinity_np (pthread_self (), gomp_cpuset_size,
+ cpusetp);
+ if (ret == 0)
+ {
+ /* Count only the CPUs this process can use. */
+ nthreads_var = cpuset_popcount (cpuset_size, cpusetp);
+ if (nthreads_var == 0)
+ break;
+ get_cpuset_size = cpuset_size;
+#ifdef CPU_ALLOC_SIZE
+ unsigned long i;
+ for (i = cpuset_size * 8; i; i--)
+ if (CPU_ISSET_S (i - 1, cpuset_size, cpusetp))
+ break;
+ cpuset_size = CPU_ALLOC_SIZE (i);
+#endif
+ return;
+ }
+ if (ret != EINVAL)
+ break;
+#ifdef CPU_ALLOC_SIZE
+ if (cpuset_size < sizeof (cpu_set_t))
+ cpuset_size = sizeof (cpu_set_t);
+ else
+ cpuset_size = cpuset_size * 2;
+ if (cpuset_size < 8 * sizeof (cpu_set_t))
+ cpusetp
+ = (cpu_set_t *) realloc (cpusetp, cpuset_size);
+ else
+ {
+ /* Avoid fatal if too large memory allocation would be
+ requested, e.g. kernel returning EINVAL all the time. */
+ void *p = realloc (cpusetp, cpuset_size);
+ if (p == NULL)
+ break;
+ cpusetp = (cpu_set_t *) p;
+ }
+#else
+ break;
+#endif
+ }
+ while (1);
+ cpuset_size = 0;
+ nthreads_var = 1;
+ free (cpusetp);
+ cpusetp = NULL;
+#endif
+#ifdef _SC_NPROCESSORS_ONLN
+ nthreads_var = sysconf (_SC_NPROCESSORS_ONLN);
+#endif
+}
+
+/* FIXME: once using -std=c++11, we can use std::thread::hardware_concurrency. */
+
/* Test and return reason why a jobserver cannot be detected. */
static const char *
const char *incoming_dumppfx = dumppfx = NULL;
static char current_dir[] = { '.', DIR_SEPARATOR, '\0' };
- /* Number of CPUs that can be used for parallel LTRANS phase. */
- unsigned long nthreads_var = std::thread::hardware_concurrency ();
-
/* Get the driver and options. */
collect_gcc = getenv ("COLLECT_GCC");
if (!collect_gcc)
else if (auto_parallel)
{
char buf[256];
+ init_num_threads ();
if (nthreads_var == 0)
nthreads_var = 1;
if (verbose)