src/xcalls/x_close.c

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#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <misc/debug.h>
#include <misc/errno.h>
#include <core/tx.h>
#include <core/config.h>
#include <core/koa.h>
#include <core/buffer.h>
#include <core/stats.h>
#include <libc/syscalls.h>
#include <core/txdesc.h>
#include <xcalls/xcalls.h>


typedef struct x_close_commit_args_s x_close_commit_args_t;

struct x_close_commit_args_s {
        int       fd;
        txc_koa_t *koa;
};


static
void
x_close_commit(void *args, int *result)
{
        int                   local_errno = 0; 
        x_close_commit_args_t *myargs = (x_close_commit_args_t *) args;
        txc_koamgr_t          *koamgr;
        txc_result_t          xret;

        koamgr = txc_koa_get_koamgr(myargs->koa);
        txc_koa_lock_alias_cache(koamgr);
        txc_koa_lock_fd(koamgr, myargs->fd);
        xret = txc_koa_detach_fd(myargs->koa, myargs->fd, 0);
        if (xret == TXC_R_SUCCESS) {
                if (txc_libc_close(myargs->fd) < 0) {
                        local_errno = errno;
                }       
        } else {
                local_errno = EBADF;

        }
        txc_koa_unlock_fd(koamgr, myargs->fd);
        txc_koa_unlock_alias_cache(koamgr);
        if (result) {
                *result = local_errno;
        }
}


int
XCALL_DEF(x_close)(int fildes, int *result) 
{
        txc_tx_t              *txd;
        txc_koamgr_t          *koamgr = txc_g_koamgr;
        txc_koa_t             *koa;
        txc_sentinel_t        *sentinel;
        txc_result_t          xret;
        int                   ret;
        x_close_commit_args_t *args_commit; 
        int                   local_result = 0;

        txd = txc_tx_get_txd();

        switch(txc_tx_get_xactstate(txd)) {
                case TXC_XACTSTATE_TRANSACTIONAL_RETRYABLE:
                        txc_koa_lock_fd(koamgr, fildes);
                        xret = txc_koa_lookup_fd2koa(koamgr, fildes, &koa);
                        if (xret == TXC_R_FAILURE) {
                                /* 
                                 * The KOA mapped to the file descriptor has gone. Report
                                 * this error as invalid file descriptor.
                                 */
                                txc_koa_unlock_fd(koamgr, fildes);
                                local_result = EBADF;
                                ret = -1;
                                goto done;
                        }

                        sentinel = txc_koa_get_sentinel(koa);
                        xret = txc_sentinel_tryacquire(txd, sentinel, TXC_SENTINEL_ACQUIREONRETRY);
                        if (xret == TXC_R_BUSYSENTINEL) {
                                txc_koa_unlock_fd(koamgr, fildes);
                                txc_tx_abort_transaction(txd, TXC_ABORTREASON_BUSYSENTINEL);
                                TXC_INTERNALERROR("Never gets here. Transaction abort failed.\n");
                        } else {
                                txc_koa_unlock_fd(koamgr, fildes);
                        }

                        args_commit = (x_close_commit_args_t *)
                                      txc_buffer_linear_malloc(txd->buffer_linear, 
                                                               sizeof(x_close_commit_args_t));
                        if (args_commit == NULL) {
                                TXC_INTERNALERROR("Allocation failed. Linear buffer out of space.\n");
                        }
                        args_commit->koa = koa;
                        args_commit->fd = fildes;

                        txc_tx_register_commit_action(txd, x_close_commit, 
                                                      (void *) args_commit, result,
                                                      TXC_KOA_DESTROY_COMMIT_ACTION_ORDER);

                        txc_koa_unlock_fd(koamgr, fildes);
                        ret = 0;
                        txc_stats_txstat_increment(txd, XCALL, x_close, 1);
                        break;
                case TXC_XACTSTATE_TRANSACTIONAL_IRREVOCABLE:
                case TXC_XACTSTATE_NONTRANSACTIONAL:
                        /* 
                         * Even if xCalls don't provide transactional properties when called
                         * outside of a transaction, we still need to destroy a KOA. Thus we
                         * still need to properly synchronize accesses to internal data
                         * structures.
                         */
                        txc_koa_lock_alias_cache(koamgr);
                        if ((ret = txc_libc_close(fildes)) < 0) { 
                                txc_koa_unlock_alias_cache(koamgr);
                                local_result = errno;
                                goto done;
                        }
                        xret = txc_koa_lookup_fd2koa(koamgr, fildes, &koa);
                        txc_koa_detach_fd(koa, fildes, 1);
                        txc_koa_unlock_alias_cache(koamgr);
                        ret = fildes;
        }       
done:
        if (result) {
                *result = local_result;
        }
        return ret;
}

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