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log.h  view on Meta::CPAN

typedef struct {
    uint32_t magic;
    uint32_t version;
    uint64_t data_size;        /* 8: usable data region size */
    uint64_t total_size;       /* 16 */
    uint64_t data_off;         /* 24 */
    uint8_t  _pad0[32];        /* 32-63 */

    uint64_t tail;             /* 64: byte offset past last entry (CAS target) */
    uint64_t count;            /* 72: number of committed entries */
    uint32_t waiters;          /* 80: blocked tailers */
    uint32_t wake_seq;         /* 84: FUTEX_WAIT target (avoids 64-bit count wraparound) */
    uint64_t stat_appends;     /* 88 */
    uint64_t stat_waits;       /* 96 */
    uint64_t stat_timeouts;    /* 104 */
    uint64_t truncation;       /* 112: entries before this offset are invalid */
    uint8_t  _pad2[8];         /* 120-127 */
} LogHeader;

#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
_Static_assert(sizeof(LogHeader) == 128, "LogHeader must be 128 bytes");