diff options
Diffstat (limited to 'man3/malloc_info.3')
| -rw-r--r-- | man3/malloc_info.3 | 55 |
1 files changed, 26 insertions, 29 deletions
diff --git a/man3/malloc_info.3 b/man3/malloc_info.3 index ef57abaab..045430b0c 100644 --- a/man3/malloc_info.3 +++ b/man3/malloc_info.3 @@ -3,7 +3,7 @@ .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft .\" -.TH malloc_info 3 2023-02-05 "Linux man-pages 6.03" +.TH malloc_info 3 2023-07-20 "Linux man-pages 6.05.01" .SH NAME malloc_info \- export malloc state to a stream .SH LIBRARY @@ -41,28 +41,25 @@ is set to indicate the error. .B EINVAL .I options was nonzero. -.SH VERSIONS -.BR malloc_info () -was added in glibc 2.10. .SH ATTRIBUTES For an explanation of the terms used in this section, see .BR attributes (7). -.ad l -.nh .TS allbox; lbx lb lb l l l. Interface Attribute Value T{ +.na +.nh .BR malloc_info () T} Thread safety MT-Safe .TE -.hy -.ad .sp 1 .SH STANDARDS -This function is a GNU extension. +GNU. +.SH HISTORY +glibc 2.10. .SH NOTES The memory-allocation information is provided as an XML string (rather than a C structure) @@ -133,7 +130,7 @@ glibc 2.13 <aspace type="total" size="135168"/> <aspace type="mprotect" size="135168"/> </malloc> - +\& ============ After allocating blocks ============ <malloc version="1"> <heap nr="0"> @@ -174,81 +171,81 @@ glibc 2.13 #include <pthread.h> #include <stdlib.h> #include <unistd.h> - +\& static size_t blockSize; static size_t numThreads; static unsigned int numBlocks; - +\& static void * thread_func(void *arg) { int tn = (int) arg; - +\& /* The multiplier \[aq](2 + tn)\[aq] ensures that each thread (including the main thread) allocates a different amount of memory. */ - +\& for (unsigned int j = 0; j < numBlocks; j++) if (malloc(blockSize * (2 + tn)) == NULL) err(EXIT_FAILURE, "malloc\-thread"); - +\& sleep(100); /* Sleep until main thread terminates. */ return NULL; } - +\& int main(int argc, char *argv[]) { int sleepTime; pthread_t *thr; - +\& if (argc < 4) { fprintf(stderr, "%s num\-threads num\-blocks block\-size [sleep\-time]\en", argv[0]); exit(EXIT_FAILURE); } - +\& numThreads = atoi(argv[1]); numBlocks = atoi(argv[2]); blockSize = atoi(argv[3]); sleepTime = (argc > 4) ? atoi(argv[4]) : 0; - +\& thr = calloc(numThreads, sizeof(*thr)); if (thr == NULL) err(EXIT_FAILURE, "calloc"); - +\& printf("============ Before allocating blocks ============\en"); malloc_info(0, stdout); - +\& /* Create threads that allocate different amounts of memory. */ - +\& for (size_t tn = 0; tn < numThreads; tn++) { errno = pthread_create(&thr[tn], NULL, thread_func, (void *) tn); if (errno != 0) err(EXIT_FAILURE, "pthread_create"); - +\& /* If we add a sleep interval after the start\-up of each thread, the threads likely won\[aq]t contend for malloc mutexes, and therefore additional arenas won\[aq]t be allocated (see malloc(3)). */ - +\& if (sleepTime > 0) sleep(sleepTime); } - +\& /* The main thread also allocates some memory. */ - +\& for (unsigned int j = 0; j < numBlocks; j++) if (malloc(blockSize) == NULL) err(EXIT_FAILURE, "malloc"); - +\& sleep(2); /* Give all threads a chance to complete allocations. */ - +\& printf("\en============ After allocating blocks ============\en"); malloc_info(0, stdout); - +\& exit(EXIT_SUCCESS); } .EE |