diff options
Diffstat (limited to 'pcilib/locking.c')
| -rw-r--r-- | pcilib/locking.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/pcilib/locking.c b/pcilib/locking.c index 1d6b51e..cbe9533 100644 --- a/pcilib/locking.c +++ b/pcilib/locking.c @@ -7,12 +7,13 @@ #include "lock.h" /* - * this function clean all locks created by the pcitool program + * this function destroys all locks without touching at kernel memory directly */ void pcilib_clean_all_locks(pcilib_t* ctx){ int i,j; void* addr; i=0; + /* iteration on all locks*/ while(i<PCILIB_NUMBER_OF_LOCK_PAGES){ addr=pcilib_kmem_get_block_ua(ctx,ctx->locks_handle,i); for(j=0;j<PCILIB_LOCKS_PER_PAGE;j++) @@ -22,6 +23,9 @@ for(j=0;j<PCILIB_LOCKS_PER_PAGE;j++) } +/* + * this functions destroy all locks and then free the kernel memory allocated for them + */ void pcilib_free_locking(pcilib_t* ctx){ pcilib_clean_all_locks(ctx); pcilib_free_kernel_memory(ctx,ctx->locks_handle,PCILIB_KMEM_FLAG_REUSE); @@ -38,8 +42,9 @@ int pcilib_init_locking(pcilib_t* ctx, ...){ int err; pcilib_kmem_reuse_state_t reused; - + /* we flock() to make sure to not have two initialization in the same time (possible long time to init)*/ if((err=flock(ctx->handle,LOCK_EX))==-1) pcilib_warning("can't get flock on /dev/fpga0"); + handle=pcilib_alloc_kernel_memory(ctx,PCILIB_KMEM_TYPE_PAGE,PCILIB_NUMBER_OF_LOCK_PAGES,PCILIB_KMEM_PAGE_SIZE,0,PCILIB_KMEM_USE(PCILIB_KMEM_USE_MUTEXES,0),PCILIB_KMEM_FLAG_REUSE|PCILIB_KMEM_FLAG_PERSISTENT); if (!handle) { @@ -49,10 +54,11 @@ int pcilib_init_locking(pcilib_t* ctx, ...){ ctx->locks_handle=handle; reused = pcilib_kmem_is_reused(ctx, handle); - #define DEBUG_REUSE +//#define DEBUG_REUSE #ifdef DEBUG_REUSE reused=0; #endif +/* verification about the handling memory got, first use or not, and integrity*/ if ((reused & PCILIB_KMEM_REUSE_REUSED) == 0) { pcilib_register_t i; @@ -61,10 +67,11 @@ reused=0; pcilib_clean_all_locks(ctx); return 1; } + /* if we get here so this is the first initialization (after some free or new), we so set kernel pages to 0 and initialize then the first lock that will be used when we create other locks*/ for(i=0;i<PCILIB_NUMBER_OF_LOCK_PAGES;i++){ memset(pcilib_kmem_get_block_ua(ctx,handle,i),0,PCILIB_KMEM_PAGE_SIZE); } - pcilib_init_lock(ctx,"pcilib_locking",LOCK_INIT); + pcilib_init_lock(ctx,PCILIB_NO_LOCK,"%s","pcilib_first_locking"); } |