xref: /unit/src/nxt_port_memory_int.h (revision 723)
180Smax.romanov@nginx.com 
280Smax.romanov@nginx.com /*
380Smax.romanov@nginx.com  * Copyright (C) Max Romanov
480Smax.romanov@nginx.com  * Copyright (C) NGINX, Inc.
580Smax.romanov@nginx.com  */
680Smax.romanov@nginx.com 
780Smax.romanov@nginx.com #ifndef _NXT_PORT_MEMORY_INT_H_INCLUDED_
880Smax.romanov@nginx.com #define _NXT_PORT_MEMORY_INT_H_INCLUDED_
980Smax.romanov@nginx.com 
1080Smax.romanov@nginx.com 
1180Smax.romanov@nginx.com #include <stdint.h>
1280Smax.romanov@nginx.com #include <nxt_atomic.h>
1380Smax.romanov@nginx.com 
1480Smax.romanov@nginx.com 
1580Smax.romanov@nginx.com #ifdef NXT_MMAP_TINY_CHUNK
1680Smax.romanov@nginx.com 
1780Smax.romanov@nginx.com #define PORT_MMAP_CHUNK_SIZE    16
1880Smax.romanov@nginx.com #define PORT_MMAP_HEADER_SIZE   1024
1980Smax.romanov@nginx.com #define PORT_MMAP_DATA_SIZE     1024
2080Smax.romanov@nginx.com 
2180Smax.romanov@nginx.com #else
2280Smax.romanov@nginx.com 
2380Smax.romanov@nginx.com #define PORT_MMAP_CHUNK_SIZE    (1024 * 16)
2480Smax.romanov@nginx.com #define PORT_MMAP_HEADER_SIZE   (1024 * 4)
2580Smax.romanov@nginx.com #define PORT_MMAP_DATA_SIZE     (1024 * 1024 * 10)
2680Smax.romanov@nginx.com 
2780Smax.romanov@nginx.com #endif
2880Smax.romanov@nginx.com 
2980Smax.romanov@nginx.com 
3080Smax.romanov@nginx.com #define PORT_MMAP_SIZE          (PORT_MMAP_HEADER_SIZE + PORT_MMAP_DATA_SIZE)
3180Smax.romanov@nginx.com #define PORT_MMAP_CHUNK_COUNT   (PORT_MMAP_DATA_SIZE / PORT_MMAP_CHUNK_SIZE)
3280Smax.romanov@nginx.com 
3380Smax.romanov@nginx.com 
3480Smax.romanov@nginx.com typedef uint32_t  nxt_chunk_id_t;
3580Smax.romanov@nginx.com 
3680Smax.romanov@nginx.com typedef nxt_atomic_uint_t  nxt_free_map_t;
3780Smax.romanov@nginx.com 
3880Smax.romanov@nginx.com #define FREE_BITS (sizeof(nxt_free_map_t) * 8)
3980Smax.romanov@nginx.com 
4080Smax.romanov@nginx.com #define FREE_IDX(nchunk) ((nchunk) / FREE_BITS)
4180Smax.romanov@nginx.com 
4280Smax.romanov@nginx.com #define FREE_MASK(nchunk)                                                     \
4380Smax.romanov@nginx.com     ( 1ULL << ( (nchunk) % FREE_BITS ) )
4480Smax.romanov@nginx.com 
4580Smax.romanov@nginx.com #define MAX_FREE_IDX FREE_IDX(PORT_MMAP_CHUNK_COUNT)
4680Smax.romanov@nginx.com 
4780Smax.romanov@nginx.com 
4880Smax.romanov@nginx.com /* Mapped at the start of shared memory segment. */
4980Smax.romanov@nginx.com struct nxt_port_mmap_header_s {
5080Smax.romanov@nginx.com     uint32_t        id;
51363Smax.romanov@nginx.com     nxt_pid_t       src_pid; /* For sanity check. */
52363Smax.romanov@nginx.com     nxt_pid_t       dst_pid; /* For sanity check. */
53323Smax.romanov@nginx.com     nxt_port_id_t   sent_over;
5480Smax.romanov@nginx.com     nxt_free_map_t  free_map[MAX_FREE_IDX];
55423Smax.romanov@nginx.com     nxt_free_map_t  free_map_padding;
56423Smax.romanov@nginx.com     nxt_free_map_t  free_tracking_map[MAX_FREE_IDX];
57423Smax.romanov@nginx.com     nxt_free_map_t  free_tracking_map_padding;
58423Smax.romanov@nginx.com     nxt_atomic_t    tracking[PORT_MMAP_CHUNK_COUNT];
5980Smax.romanov@nginx.com };
6080Smax.romanov@nginx.com 
6180Smax.romanov@nginx.com 
62365Smax.romanov@nginx.com struct nxt_port_mmap_handler_s {
63365Smax.romanov@nginx.com     nxt_port_mmap_header_t  *hdr;
64365Smax.romanov@nginx.com     nxt_atomic_t            use_count;
65365Smax.romanov@nginx.com };
66365Smax.romanov@nginx.com 
6780Smax.romanov@nginx.com /*
6880Smax.romanov@nginx.com  * Element of nxt_process_t.incoming/outgoing, shared memory segment
6980Smax.romanov@nginx.com  * descriptor.
7080Smax.romanov@nginx.com  */
7180Smax.romanov@nginx.com struct nxt_port_mmap_s {
72365Smax.romanov@nginx.com     nxt_port_mmap_handler_t  *mmap_handler;
7380Smax.romanov@nginx.com };
7480Smax.romanov@nginx.com 
7580Smax.romanov@nginx.com typedef struct nxt_port_mmap_msg_s nxt_port_mmap_msg_t;
7680Smax.romanov@nginx.com 
7780Smax.romanov@nginx.com /* Passed as a second iov chunk when 'mmap' bit in nxt_port_msg_t is 1. */
7880Smax.romanov@nginx.com struct nxt_port_mmap_msg_s {
7980Smax.romanov@nginx.com     uint32_t            mmap_id;    /* Mmap index in nxt_process_t.outgoing. */
8080Smax.romanov@nginx.com     nxt_chunk_id_t      chunk_id;   /* Mmap chunk index. */
8180Smax.romanov@nginx.com     uint32_t            size;       /* Payload data size. */
8280Smax.romanov@nginx.com };
8380Smax.romanov@nginx.com 
8480Smax.romanov@nginx.com 
85423Smax.romanov@nginx.com typedef struct nxt_port_mmap_tracking_msg_s nxt_port_mmap_tracking_msg_t;
8680Smax.romanov@nginx.com 
87423Smax.romanov@nginx.com struct nxt_port_mmap_tracking_msg_s {
88423Smax.romanov@nginx.com     uint32_t            mmap_id;    /* Mmap index in nxt_process_t.outgoing. */
89423Smax.romanov@nginx.com     nxt_chunk_id_t      tracking_id;   /* Tracking index. */
90423Smax.romanov@nginx.com };
91423Smax.romanov@nginx.com 
92*723Smax.romanov@nginx.com nxt_inline nxt_bool_t
93423Smax.romanov@nginx.com nxt_port_mmap_get_free_chunk(nxt_free_map_t *m, nxt_chunk_id_t *c);
94423Smax.romanov@nginx.com 
95423Smax.romanov@nginx.com #define nxt_port_mmap_get_chunk_busy(m, c)                                    \
96423Smax.romanov@nginx.com     ((m[FREE_IDX(c)] & FREE_MASK(c)) == 0)
9780Smax.romanov@nginx.com 
9880Smax.romanov@nginx.com nxt_inline void
99423Smax.romanov@nginx.com nxt_port_mmap_set_chunk_busy(nxt_free_map_t *m, nxt_chunk_id_t c);
10080Smax.romanov@nginx.com 
10180Smax.romanov@nginx.com nxt_inline nxt_bool_t
102423Smax.romanov@nginx.com nxt_port_mmap_chk_set_chunk_busy(nxt_free_map_t *m, nxt_chunk_id_t c);
10380Smax.romanov@nginx.com 
10480Smax.romanov@nginx.com nxt_inline void
105423Smax.romanov@nginx.com nxt_port_mmap_set_chunk_free(nxt_free_map_t *m, nxt_chunk_id_t c);
10680Smax.romanov@nginx.com 
10780Smax.romanov@nginx.com nxt_inline nxt_chunk_id_t
10880Smax.romanov@nginx.com nxt_port_mmap_chunk_id(nxt_port_mmap_header_t *hdr, u_char *p)
10980Smax.romanov@nginx.com {
11080Smax.romanov@nginx.com     u_char  *mm_start;
11180Smax.romanov@nginx.com 
11280Smax.romanov@nginx.com     mm_start = (u_char *) hdr;
11380Smax.romanov@nginx.com 
11480Smax.romanov@nginx.com     return ((p - mm_start) - PORT_MMAP_HEADER_SIZE) / PORT_MMAP_CHUNK_SIZE;
11580Smax.romanov@nginx.com }
11680Smax.romanov@nginx.com 
11780Smax.romanov@nginx.com 
11880Smax.romanov@nginx.com nxt_inline u_char *
11980Smax.romanov@nginx.com nxt_port_mmap_chunk_start(nxt_port_mmap_header_t *hdr, nxt_chunk_id_t c)
12080Smax.romanov@nginx.com {
12180Smax.romanov@nginx.com     u_char  *mm_start;
12280Smax.romanov@nginx.com 
12380Smax.romanov@nginx.com     mm_start = (u_char *) hdr;
12480Smax.romanov@nginx.com 
12580Smax.romanov@nginx.com     return mm_start + PORT_MMAP_HEADER_SIZE + c * PORT_MMAP_CHUNK_SIZE;
12680Smax.romanov@nginx.com }
12780Smax.romanov@nginx.com 
12880Smax.romanov@nginx.com 
129*723Smax.romanov@nginx.com nxt_inline nxt_bool_t
130423Smax.romanov@nginx.com nxt_port_mmap_get_free_chunk(nxt_free_map_t *m, nxt_chunk_id_t *c)
13180Smax.romanov@nginx.com {
132699Smax.romanov@nginx.com     const nxt_free_map_t  default_mask = (nxt_free_map_t) -1;
133699Smax.romanov@nginx.com 
13480Smax.romanov@nginx.com     int             ffs;
135699Smax.romanov@nginx.com     size_t          i, start;
13680Smax.romanov@nginx.com     nxt_chunk_id_t  chunk;
137699Smax.romanov@nginx.com     nxt_free_map_t  bits, mask;
138699Smax.romanov@nginx.com 
139699Smax.romanov@nginx.com     start = FREE_IDX(*c);
140699Smax.romanov@nginx.com     mask = default_mask << ((*c) % FREE_BITS);
14180Smax.romanov@nginx.com 
142699Smax.romanov@nginx.com     for (i = start; i < MAX_FREE_IDX; i++) {
143699Smax.romanov@nginx.com         bits = m[i] & mask;
144699Smax.romanov@nginx.com         mask = default_mask;
145699Smax.romanov@nginx.com 
14680Smax.romanov@nginx.com         if (bits == 0) {
14780Smax.romanov@nginx.com             continue;
14880Smax.romanov@nginx.com         }
14980Smax.romanov@nginx.com 
15080Smax.romanov@nginx.com         ffs = __builtin_ffsll(bits);
15180Smax.romanov@nginx.com         if (ffs != 0) {
15280Smax.romanov@nginx.com             chunk = i * FREE_BITS + ffs - 1;
15380Smax.romanov@nginx.com 
154423Smax.romanov@nginx.com             if (nxt_port_mmap_chk_set_chunk_busy(m, chunk)) {
15580Smax.romanov@nginx.com                 *c = chunk;
15680Smax.romanov@nginx.com                 return 1;
15780Smax.romanov@nginx.com             }
15880Smax.romanov@nginx.com         }
15980Smax.romanov@nginx.com     }
16080Smax.romanov@nginx.com 
16180Smax.romanov@nginx.com     return 0;
16280Smax.romanov@nginx.com }
16380Smax.romanov@nginx.com 
16480Smax.romanov@nginx.com 
16580Smax.romanov@nginx.com nxt_inline void
166423Smax.romanov@nginx.com nxt_port_mmap_set_chunk_busy(nxt_free_map_t *m, nxt_chunk_id_t c)
16780Smax.romanov@nginx.com {
168423Smax.romanov@nginx.com     nxt_atomic_and_fetch(m + FREE_IDX(c), ~FREE_MASK(c));
16980Smax.romanov@nginx.com }
17080Smax.romanov@nginx.com 
17180Smax.romanov@nginx.com 
17280Smax.romanov@nginx.com nxt_inline nxt_bool_t
173423Smax.romanov@nginx.com nxt_port_mmap_chk_set_chunk_busy(nxt_free_map_t *m, nxt_chunk_id_t c)
17480Smax.romanov@nginx.com {
17580Smax.romanov@nginx.com     nxt_free_map_t  *f;
17680Smax.romanov@nginx.com     nxt_free_map_t  free_val, busy_val;
17780Smax.romanov@nginx.com 
178423Smax.romanov@nginx.com     f = m + FREE_IDX(c);
17980Smax.romanov@nginx.com 
18080Smax.romanov@nginx.com     while ( (*f & FREE_MASK(c)) != 0 ) {
18180Smax.romanov@nginx.com 
18280Smax.romanov@nginx.com         free_val = *f | FREE_MASK(c);
18380Smax.romanov@nginx.com         busy_val = free_val & ~FREE_MASK(c);
18480Smax.romanov@nginx.com 
18580Smax.romanov@nginx.com         if (nxt_atomic_cmp_set(f, free_val, busy_val) != 0) {
18680Smax.romanov@nginx.com             return 1;
18780Smax.romanov@nginx.com         }
18880Smax.romanov@nginx.com     }
18980Smax.romanov@nginx.com 
19080Smax.romanov@nginx.com     return 0;
19180Smax.romanov@nginx.com }
19280Smax.romanov@nginx.com 
19380Smax.romanov@nginx.com 
19480Smax.romanov@nginx.com nxt_inline void
195423Smax.romanov@nginx.com nxt_port_mmap_set_chunk_free(nxt_free_map_t *m, nxt_chunk_id_t c)
19680Smax.romanov@nginx.com {
197423Smax.romanov@nginx.com     nxt_atomic_or_fetch(m + FREE_IDX(c), FREE_MASK(c));
19880Smax.romanov@nginx.com }
19980Smax.romanov@nginx.com 
20080Smax.romanov@nginx.com 
20180Smax.romanov@nginx.com #endif /* _NXT_PORT_MEMORY_INT_H_INCLUDED_ */
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