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tap-vsockd: allocate payload separately for better alignment

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Previously we allocated `sizeof(struct ring) + size`. This patch
allocates `sizeof(struct ring)` and then `size` for the payload
separately. Hopefully the payload will be better aligned.

Signed-off-by: David Scott <dave.scott@docker.com>
This commit is contained in:
David Scott 2017-01-23 14:44:34 +00:00
parent 3fc0d994b5
commit 370a43de83
1 changed files with 7 additions and 3 deletions
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10
alpine/packages/tap-vsockd/ring.c
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@ -23,14 +23,18 @@ struct ring {
int size; /* Maximum number of buffered bytes */ int size; /* Maximum number of buffered bytes */
pthread_cond_t c; pthread_cond_t c;
pthread_mutex_t m; pthread_mutex_t m;
char data[]; char *data;
}; };
struct ring *ring_allocate(int size) struct ring *ring_allocate(int size)
{ {
struct ring *ring = (struct ring*)malloc(sizeof(struct ring) + size); struct ring *ring = (struct ring*)malloc(sizeof(struct ring));
if (!ring) { if (!ring) {
fatal("Failed to allocate ring buffer"); fatal("Failed to allocate ring buffer metadata");
}
ring->data = (char*)malloc(size);
if (!ring->data) {
fatal("Failed to allocate ring buffer data");
} }
int err = 0; int err = 0;
if ((err = pthread_cond_init(&ring->c, NULL)) != 0) { if ((err = pthread_cond_init(&ring->c, NULL)) != 0) {