You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sqlite_windows_amd64.go
    path of file: ./repos/gotosocial/vendor/modernc.org/sqlite/lib
    
    the code of the file until where you have to start completion: // Code generated by 'ccgo -DSQLITE_PRIVATE= -export-defines "" -export-enums "" -export-externs X -export-fields F -export-typedefs "" -ignore-unsupported-alignment -pkgname sqlite3 -volatile=sqlite3_io_error_pending,sqlite3_open_file_count,sqlite3_pager_readdb_count,sqlite3_pager_writedb_count,sqlite3_pager_writej_count,sqlite3_search_count,sqlite3_sort
    
func Xsqlite3PcacheReleaseMemory(tls *libc.TLS, nReq int32) int32 {
	var nFree int32 = 0

	if Xsqlite3Config.FpPage == uintptr(0) {
		var p uintptr
		Xsqlite3_mutex_enter(tls, (*PGroup)(unsafe.Pointer(uintptr(unsafe.Pointer(&pcache1_g)))).Fmutex)
		for (nReq < 0 || nFree < nReq) &&
			libc.AssignUintptr(&p, pcache1_g.Fgrp.Flru.FpLruPrev) != uintptr(0) &&
			int32((*PgHdr1)(unsafe.Pointer(p)).FisAnchor) == 0 {
			nFree = nFree + pcache1MemSize(tls, (*PgHdr1)(unsafe.Pointer(p)).Fpage.FpBuf)

			pcache1PinPage(tls, p)
			pcache1RemoveFromHash(tls, p, 1)
		}
		Xsqlite3_mutex_leave(tls, (*PGroup)(unsafe.Pointer(uintptr(unsafe.Pointer(&pcache1_g)))).Fmutex)
	}
	return nFree
}